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Groups > linux.debian.user > #230005 > unrolled thread

No GRUB with brand-new GPU

Started byThe Wanderer <wanderer@fastmail.fm>
First post2020-12-26 23:30 +0100
Last post2020-12-30 04:10 +0100
Articles 20 on this page of 72 — 14 participants

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Contents

  No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-26 23:30 +0100
    Re: No GRUB with brand-new GPU Georgi Naplatanov <gosho@oles.biz> - 2020-12-26 23:40 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-26 23:50 +0100
      Re: No GRUB with brand-new GPU Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-27 01:00 +0100
        Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 01:20 +0100
          Re: No GRUB with brand-new GPU Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-27 01:50 +0100
            Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 02:00 +0100
    Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-27 00:30 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 00:50 +0100
        Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-27 01:40 +0100
        Re: No GRUB with brand-new GPU Sven Joachim <svenjoac@gmx.de> - 2020-12-27 09:00 +0100
          Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 13:20 +0100
            Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 16:30 +0100
              Re: No GRUB with brand-new GPU Anssi Saari <as@sci.fi> - 2020-12-27 22:40 +0100
                Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 23:10 +0100
                  Re: No GRUB with brand-new GPU <tomas@tuxteam.de> - 2020-12-27 23:30 +0100
                    Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 23:40 +0100
                      Re: No GRUB with brand-new GPU Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-28 09:20 +0100
                  Re: No GRUB with brand-new GPU Anssi Saari <as@sci.fi> - 2020-12-28 13:50 +0100
                    Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-28 14:00 +0100
                      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-28 22:20 +0100
                        Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-28 23:10 +0100
                          Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-28 23:30 +0100
                            Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-29 00:30 +0100
                              Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 00:40 +0100
                                Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-29 01:30 +0100
                            Re: No GRUB with brand-new GPU Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-29 02:40 +0100
                              Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 13:30 +0100
                            Re: No GRUB with brand-new GPU Anssi Saari <as@sci.fi> - 2020-12-29 11:20 +0100
                              Re: No GRUB with brand-new GPU "Thomas Schmitt" <scdbackup@gmx.net> - 2020-12-29 12:10 +0100
                                Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 13:00 +0100
                                  Re: No GRUB with brand-new GPU Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-29 19:10 +0100
                                    Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 19:20 +0100
                                      Re: No GRUB with brand-new GPU Romualdas Taluntis <romualdas@taluntis.lt> - 2020-12-29 20:30 +0100
                                        Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 20:30 +0100
                                          Re: No GRUB with brand-new GPU Romualdas Taluntis <romualdas@taluntis.lt> - 2020-12-29 21:00 +0100
                                            Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 21:20 +0100
                                              Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 21:40 +0100
                                              Re: No GRUB with brand-new GPU Georgi Naplatanov <gosho@oles.biz> - 2020-12-29 21:40 +0100
                                          Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-29 21:20 +0100
                                      Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-29 22:50 +0100
                                        Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 23:00 +0100
                                          Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-29 23:40 +0100
                                            Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-30 03:50 +0100
                                              Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-30 04:40 +0100
                                                Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-30 05:00 +0100
                                                  Re: No GRUB with brand-new GPU Doug McGarrett <dmcgarrett@optonline.net> - 2020-12-30 06:00 +0100
                                                  Re: No GRUB with brand-new GPU <tomas@tuxteam.de> - 2020-12-30 10:20 +0100
                                                  Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-30 15:00 +0100
                                                    Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-30 19:40 +0100
                                                      Re: No GRUB with brand-new GPU Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-30 20:10 +0100
                                                      Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-30 20:20 +0100
                                                        Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-30 22:10 +0100
                                                          Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-30 22:40 +0100
                              Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 13:20 +0100
                                Re: No GRUB with brand-new GPU Anssi Saari <as@sci.fi> - 2020-12-29 22:50 +0100
                                  Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 23:00 +0100
    Re: No GRUB with brand-new GPU Tony Rowe <torowe@gmail.com> - 2020-12-27 02:10 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 02:20 +0100
    Re: No GRUB with brand-new GPU David Wright <deblis@lionunicorn.co.uk> - 2020-12-27 05:10 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 13:10 +0100
        Re: No GRUB with brand-new GPU David Wright <deblis@lionunicorn.co.uk> - 2020-12-28 02:50 +0100
    Re: No GRUB with brand-new GPU Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-27 08:40 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-27 13:10 +0100
        Re: No GRUB with brand-new GPU Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-28 09:30 +0100
    Re: No GRUB with brand-new GPU Romualdas Taluntis <romualdas@taluntis.lt> - 2020-12-29 14:00 +0100
      Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 14:00 +0100
        Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-29 18:10 +0100
          Re: No GRUB with brand-new GPU The Wanderer <wanderer@fastmail.fm> - 2020-12-29 18:20 +0100
            Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-29 18:40 +0100
              Re: No GRUB with brand-new GPU Michael Stone <mstone@debian.org> - 2020-12-29 19:20 +0100
                Re: No GRUB with brand-new GPU Felix Miata <mrmazda@earthlink.net> - 2020-12-30 04:10 +0100

Page 1 of 4  [1] 2 3 4  Next page →


#230005 — No GRUB with brand-new GPU

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-26 23:30 +0100
SubjectNo GRUB with brand-new GPU
Message-ID<Bqqew-xP-53@gated-at.bofh.it>

[Multipart message — attachments visible in raw view] — view raw

I have for some years been running Debian with an older model of AMD GPU
(Radeon HD 6870) for graphics.

I recently purchased a relatively recent model of GPU (Radeon RX 5700
XT), and today swapped it in and attempted to boot with it.

I was expecting to get no graphics support (e.g., X, et cetera) until
after adjusting some combination of installed driver- and
firmware-related packages, module-blacklist settings, boot-time options,
initrd state, GRUB configuration, and possibly other (again, e.g., X)
config files. I'm generally fine with wrangling that, and based on my
pre-swap research, was expecting to be able to get up and running with
the new GPU today.

What I got, instead, was not even that far.

With the new GPU in place, I get video output during POST and in the
BIOS (yes, this machine is old enough that it doesn't have a UEFI)
without problems. That demonstrates that the GPU isn't dead on arrival,
and that signal is getting through to the monitor on a basic level.

However, as soon as the machine tries to hand over control to the
bootloader, I get a hard freeze; the screen goes black (albeit I think
still with backlight), the keyboard light toggle keys stop responding,
and the GRUB menu never appears. Waiting a long time doesn't change
anything; even after roughly half an hour of waiting, pressing the Power
button once (no press-and-hold) shuts the system off immediately, which
indicates that the system hasn't progressed much (if at all) past early
boot.

Thus far, Google has not been helpful. I find plenty about black screens
after GRUB, but very little about before GRUB and after POST, and what
little I find is from other distros - some Ubuntu (earlier versions,
mostly 2010-era), some Arch, some RHEL - which don't necessarily handle
either graphics drivers or GRUB in a way that will let their directions
reliably translate to Debian.


Any suggestions for what to try?

I'm back up now with the old GPU, since researching this on my
smartphone was going nowhere. I've dug into /etc/grub* and /boot/
looking for anything which seemed related, with no promising hits yet.

Barring other discoveries, my current next step is to dig up a suitably
recent Debian-based live-boot environment, boot to that, and see what it
does. If it gives me usable graphics, I want to see what it's doing at
bootloader time, and what parts I might be able to transpose into my
primary install.

However, given that live-boot setups don't always handle the early parts
of boot the same way as hard-drive installs do, I'm not positive this
will be fruitful. Also, given how relatively new this card is, I'm not
sure I'll be able to find a suitable environment which does work with it
to the level I need.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230006

FromGeorgi Naplatanov <gosho@oles.biz>
Date2020-12-26 23:40 +0100
Message-ID<Bqqoa-BP-21@gated-at.bofh.it>
In reply to#230005
On 12/27/20 12:19 AM, The Wanderer wrote:
> I have for some years been running Debian with an older model of AMD GPU
> (Radeon HD 6870) for graphics.
> 
> I recently purchased a relatively recent model of GPU (Radeon RX 5700
> XT), and today swapped it in and attempted to boot with it.
> 
> I was expecting to get no graphics support (e.g., X, et cetera) until
> after adjusting some combination of installed driver- and
> firmware-related packages, module-blacklist settings, boot-time options,
> initrd state, GRUB configuration, and possibly other (again, e.g., X)
> config files. I'm generally fine with wrangling that, and based on my
> pre-swap research, was expecting to be able to get up and running with
> the new GPU today.
> 
> What I got, instead, was not even that far.
> 
> With the new GPU in place, I get video output during POST and in the
> BIOS (yes, this machine is old enough that it doesn't have a UEFI)
> without problems. That demonstrates that the GPU isn't dead on arrival,
> and that signal is getting through to the monitor on a basic level.
> 
> However, as soon as the machine tries to hand over control to the
> bootloader, I get a hard freeze; the screen goes black (albeit I think
> still with backlight), the keyboard light toggle keys stop responding,
> and the GRUB menu never appears. Waiting a long time doesn't change
> anything; even after roughly half an hour of waiting, pressing the Power
> button once (no press-and-hold) shuts the system off immediately, which
> indicates that the system hasn't progressed much (if at all) past early
> boot.
> 
> Thus far, Google has not been helpful. I find plenty about black screens
> after GRUB, but very little about before GRUB and after POST, and what
> little I find is from other distros - some Ubuntu (earlier versions,
> mostly 2010-era), some Arch, some RHEL - which don't necessarily handle
> either graphics drivers or GRUB in a way that will let their directions
> reliably translate to Debian.
> 
> 
> Any suggestions for what to try?
> 
> I'm back up now with the old GPU, since researching this on my
> smartphone was going nowhere. I've dug into /etc/grub* and /boot/
> looking for anything which seemed related, with no promising hits yet.
> 
> Barring other discoveries, my current next step is to dig up a suitably
> recent Debian-based live-boot environment, boot to that, and see what it
> does. If it gives me usable graphics, I want to see what it's doing at
> bootloader time, and what parts I might be able to transpose into my
> primary install.
> 
> However, given that live-boot setups don't always handle the early parts
> of boot the same way as hard-drive installs do, I'm not positive this
> will be fruitful. Also, given how relatively new this card is, I'm not
> sure I'll be able to find a suitable environment which does work with it
> to the level I need.
> 


Hi,

I'm not a hardware expert but I found the following on Internet:

 - the interface for this card is PCI-Express 4.0 and I guess that your
old computer doesn't support that

 - BIOS Support - Dual UEFI - I'm not sure what this means but is it
possible this card not to be supported by non-UEFI systems ?

Kind regards
Georgi

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#230007

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-26 23:50 +0100
Message-ID<BqqxP-Fx-3@gated-at.bofh.it>
In reply to#230006

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-26 at 17:33, Georgi Naplatanov wrote:

> On 12/27/20 12:19 AM, The Wanderer wrote:
>
>> I have for some years been running Debian with an older model of AMD GPU
>> (Radeon HD 6870) for graphics.
>> 
>> I recently purchased a relatively recent model of GPU (Radeon RX 5700
>> XT), and today swapped it in and attempted to boot with it.

>> With the new GPU in place, I get video output during POST and in the
>> BIOS (yes, this machine is old enough that it doesn't have a UEFI)
>> without problems. That demonstrates that the GPU isn't dead on arrival,
>> and that signal is getting through to the monitor on a basic level.
>> 
>> However, as soon as the machine tries to hand over control to the
>> bootloader, I get a hard freeze; the screen goes black (albeit I think
>> still with backlight), the keyboard light toggle keys stop responding,
>> and the GRUB menu never appears. Waiting a long time doesn't change
>> anything; even after roughly half an hour of waiting, pressing the Power
>> button once (no press-and-hold) shuts the system off immediately, which
>> indicates that the system hasn't progressed much (if at all) past early
>> boot.

> Hi,
> 
> I'm not a hardware expert but I found the following on Internet:
> 
>  - the interface for this card is PCI-Express 4.0 and I guess that your
> old computer doesn't support that
> 
>  - BIOS Support - Dual UEFI - I'm not sure what this means but is it
> possible this card not to be supported by non-UEFI systems ?

I'd consider these plausible enough to pursue, except for the fact that
(as noted above) I do get display output just fine during POST and in
the BIOS. If the slot interface weren't compatible, I'd expect to not
get any video output from the system at all.

"Dual UEFI" I don't remember seeing in regard to this device; I'm not
sure what it'd mean for a GPU. It's normally something I expect to see
for a motherboard, where it would mean that the device supports having
two different UEFIs in place at once, so you can flash a new one and
still have the old one to fall back to if the new one fails.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

[toc] | [prev] | [next] | [standalone]


#230011

FromLinux-Fan <Ma_Sys.ma@web.de>
Date2020-12-27 01:00 +0100
Message-ID<BqrDz-1ig-5@gated-at.bofh.it>
In reply to#230006

[Multipart message — attachments visible in raw view] — view raw

Georgi Naplatanov writes:

> On 12/27/20 12:19 AM, The Wanderer wrote:
> > I have for some years been running Debian with an older model of AMD GPU
> > (Radeon HD 6870) for graphics.
> >
> > I recently purchased a relatively recent model of GPU (Radeon RX 5700
> > XT), and today swapped it in and attempted to boot with it.

[...]

> > With the new GPU in place, I get video output during POST and in the
> > BIOS (yes, this machine is old enough that it doesn't have a UEFI)
> > without problems. That demonstrates that the GPU isn't dead on arrival,
> > and that signal is getting through to the monitor on a basic level.

Curious, what machine does not do UEFI yet but still benefits from large  
GPUs such as the RX 5700?

[...]

> > Any suggestions for what to try?

[...]

> I'm not a hardware expert but I found the following on Internet:
>
>  - the interface for this card is PCI-Express 4.0 and I guess that your
> old computer doesn't support that

PCIe 4.0 is backwards-compatible (down to at least PCIe 3.0, possibly  
further).

>  - BIOS Support - Dual UEFI - I'm not sure what this means but is it
> possible this card not to be supported by non-UEFI systems ?

(Unsure on this)

[...]

I have a RadeonPro W5500 which is also too new, to be supported on Debian  
stable out of the box. What I did to get it running for basic 2D  
graphics (enough for me most of the time) was to install the following  
packages from debian-backports:

 * linux-image-5.8.0-0.bpo.2-amd64
 * firmware-amd-graphics

Additionally, I tried to enable amdgpu in xorg.conf, although I am not sure  
whether that is actually needed:

	$ cat /etc/X11/xorg.conf
	Section "Device"
		Identifier "AMD"
		Driver "amdgpu"
	EndSection

This system is using UEFI to boot and I do not recall having the same issue  
(black screen) even before, though.

Here are some other suggestions:

As you mentioned GRUB not loading correctly, could there perhaps be an  
explicit graphics resolution configuration entry? I do not have any special  
configuration enabled there:

	$ grep -E '(GFXMODE|TERMINAL)' /etc/default/grub
	#GRUB_TERMINAL=console
	#GRUB_GFXMODE=640x480

Apart from a live system, it could already be helpful to boot a Debian  
installer to see if it can load a Linux if GRUB is not invovled. If that  
works (i.e. presents language selection screen), checking with a live system  
seems to be a reasonable next step.

If you need the 3D accelleration performance (why buy an RX 5700 if not?),  
I'd suggest to setup a Debian testing environment for that. I managed to get  
some (fast enough for me) 3D accelleration working by creating a Debian  
sid chroot (testing did not have some dependencies I needed) and I can use  
it by logging in through TTY2 -> chroot -> startx. BUT: Please note that  
this setup is brittle -- dual-boot or testing-only configurations can be  
expected to run _more stable_ in this scenario :)

HTH
Linux-Fan

öö

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#230012

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 01:20 +0100
Message-ID<BqrWV-1DX-1@gated-at.bofh.it>
In reply to#230011

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-26 at 18:50, Linux-Fan wrote:

> Georgi Naplatanov writes:
> 
>> On 12/27/20 12:19 AM, The Wanderer wrote:
>> > I have for some years been running Debian with an older model of AMD GPU
>> > (Radeon HD 6870) for graphics.
>> >
>> > I recently purchased a relatively recent model of GPU (Radeon RX 570
0
>> > XT), and today swapped it in and attempted to boot with it.

>> > With the new GPU in place, I get video output during POST and in the
>> > BIOS (yes, this machine is old enough that it doesn't have a UEFI)
>> > without problems. That demonstrates that the GPU isn't dead on arrival,
>> > and that signal is getting through to the monitor on a basic level.
> 
> Curious, what machine does not do UEFI yet but still benefits from large  
> GPUs such as the RX 5700?

One I built from parts back when the 6870 was still in the sweet spot of
price vs. performance, with then-outsize specs in other regards,
including what was at the time the top-end non-server CPU in the world.
It's fallen well behind that standard, but is still far from the
bottleneck in my system.

The motivation for the GPU upgrade is that the card I have seems to be
literally the last model made that doesn't support the required baseline
for a game I've seen recommended. Based on the most recent
Linux-including reviews as of the time I made the choice, the 5700 seems
to be the current best option in terms of price vs. (performance /
future-proofing).

>> > Any suggestions for what to try?

> I have a RadeonPro W5500 which is also too new, to be supported on Debian  
> stable out of the box. What I did to get it running for basic 2D  
> graphics (enough for me most of the time) was to install the following  
> packages from debian-backports:
> 
>  * linux-image-5.8.0-0.bpo.2-amd64
>  * firmware-amd-graphics
> 
> Additionally, I tried to enable amdgpu in xorg.conf, although I am not sure  
> whether that is actually needed:
> 
> 	$ cat /etc/X11/xorg.conf
> 	Section "Device"
> 		Identifier "AMD"
> 		Driver "amdgpu"
> 	EndSection
> 
> This system is using UEFI to boot and I do not recall having the same issue  
> (black screen) even before, though.

All of those are part of what I expected to have to wrangle post-boot in
order to get things working. (I'm running Debian testing, for what
that's worth, so the kernel and so forth should already be new enough.)

> Here are some other suggestions:
> 
> As you mentioned GRUB not loading correctly, could there perhaps be an  
> explicit graphics resolution configuration entry? I do not have any special  
> configuration enabled there:
> 
> 	$ grep -E '(GFXMODE|TERMINAL)' /etc/default/grub
> 	#GRUB_TERMINAL=console
> 	#GRUB_GFXMODE=640x480

Doesn't seem so; the output I get from that command is identical.

> Apart from a live system, it could already be helpful to boot a Debian  
> installer to see if it can load a Linux if GRUB is not invovled. If that  
> works (i.e. presents language selection screen), checking with a live system  
> seems to be a reasonable next step.

By my terminology, a Debian installer *is* a (special case of a)
live-boot environment. Which is not to say it would necessarily have
been my choice to test this, but it might.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

[toc] | [prev] | [next] | [standalone]


#230014

FromLinux-Fan <Ma_Sys.ma@web.de>
Date2020-12-27 01:50 +0100
Message-ID<BqspX-1Nx-1@gated-at.bofh.it>
In reply to#230012

[Multipart message — attachments visible in raw view] — view raw

The Wanderer writes:

> On 2020-12-26 at 18:50, Linux-Fan wrote:
>
> > Georgi Naplatanov writes:
> >
> >> On 12/27/20 12:19 AM, The Wanderer wrote:
> >> > I have for some years been running Debian with an older model of AMD GPU
> >> > (Radeon HD 6870) for graphics.
> >> >
> >> > I recently purchased a relatively recent model of GPU (Radeon RX 5700
> >> > XT), and today swapped it in and attempted to boot with it.
>
> >> > With the new GPU in place, I get video output during POST and in the
> >> > BIOS (yes, this machine is old enough that it doesn't have a UEFI)
> >> > without problems. That demonstrates that the GPU isn't dead on arrival,
> >> > and that signal is getting through to the monitor on a basic level.
> >
> > Curious, what machine does not do UEFI yet but still benefits from large
> > GPUs such as the RX 5700?
>
> One I built from parts back when the 6870 was still in the sweet spot of
> price vs. performance, with then-outsize specs in other regards,
> including what was at the time the top-end non-server CPU in the world.
> It's fallen well behind that standard, but is still far from the
> bottleneck in my system.
>
> The motivation for the GPU upgrade is that the card I have seems to be
> literally the last model made that doesn't support the required baseline
> for a game I've seen recommended. Based on the most recent
> Linux-including reviews as of the time I made the choice, the 5700 seems
> to be the current best option in terms of price vs. (performance /
> future-proofing).

OK, that makes sense. I just wanted to ask because I was once in a similar  
situation. I had upgraded my venerable HP Z400 (Xeon W3550 -- not the fastet  
at the time) by adding a Radeon RX 570 to replace the previous Nvidia GTX  
570 card and had... zero performance improvement in gaming because without  
me noticing this in other application contexts/earlier, the CPU had become  
the bottleneck :(

> >> > Any suggestions for what to try?

[...]

> All of those are part of what I expected to have to wrangle post-boot in
> order to get things working. (I'm running Debian testing, for what
> that's worth, so the kernel and so forth should already be new enough.)

[...]

I am out of ideas on this...

> By my terminology, a Debian installer *is* a (special case of a)
> live-boot environment. Which is not to say it would necessarily have
> been my choice to test this, but it might.

[...]

I just wanted to point the installer out, because it might be more easily  
available (already existent on a medium?) and hence the easier test to do.  
Unlike many other live systems, its terminal-based UI may help rule out X11  
problems (although as noted, they are obviously not the issue at hand...)

HTH
Linux-Fan

öö

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#230015

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 02:00 +0100
Message-ID<BqszE-1Qw-5@gated-at.bofh.it>
In reply to#230014

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-26 at 19:49, Linux-Fan wrote:

> The Wanderer writes:
> 
>> On 2020-12-26 at 18:50, Linux-Fan wrote:

>>> Curious, what machine does not do UEFI yet but still benefits
>>> from large GPUs such as the RX 5700?
>> 
>> One I built from parts back when the 6870 was still in the sweet
>> spot of price vs. performance, with then-outsize specs in other
>> regards, including what was at the time the top-end non-server CPU
>> in the world. It's fallen well behind that standard, but is still
>> far from the bottleneck in my system.
>> 
>> The motivation for the GPU upgrade is that the card I have seems to
>> be literally the last model made that doesn't support the required
>> baseline for a game I've seen recommended. Based on the most
>> recent Linux-including reviews as of the time I made the choice,
>> the 5700 seems to be the current best option in terms of price vs.
>> (performance / future-proofing).
> 
> OK, that makes sense. I just wanted to ask because I was once in a
> similar situation. I had upgraded my venerable HP Z400 (Xeon W3550 --
> not the fastet at the time) by adding a Radeon RX 570 to replace the
> previous Nvidia GTX 570 card and had... zero performance improvement
> in gaming because without me noticing this in other application
> contexts/earlier, the CPU had become the bottleneck :(

Reasonable. In my case, I have a Core i7 990x Extreme, which cost me
$1050 brand-new; it may turn out to be the bottleneck with the new GPU,
but the resulting performance should still be better than what I've got,
and at least the game should actually be willing to *launch*.

Thanks for the input, regardless of whether it winds up helping.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230009

FromFelix Miata <mrmazda@earthlink.net>
Date2020-12-27 00:30 +0100
Message-ID<Bqray-18P-15@gated-at.bofh.it>
In reply to#230005
The Wanderer composed on 2020-12-26 17:19 (UTC-0500):
...
I suggest a good place to start would be to goto /etc/default/grub and switch from
whichever mode is employed to the other, either plain text to graphical, or vice
versa, then regenerate grub.cfg and try booting. While in /etc/default/grub, if
splash=silent is included, either remove it, or switch to splash=verbose. If the
switch itself doesn't help, then try graphical after selecting some specific mode
you know your display supports. I use video=1440x900 on cmdline most of the time
for the vttys even when the display's native is 1920x1080, 1920x1200 or 2560x1440.
-- 
Evolution as taught in public schools, like religion,
	is based on faith, not on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#230010

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 00:50 +0100
Message-ID<BqrtT-1fj-9@gated-at.bofh.it>
In reply to#230009

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On 2020-12-26 at 18:28, Felix Miata wrote:

> I suggest a good place to start would be to goto /etc/default/grub
> and switch from whichever mode is employed to the other, either plain
> text to graphical, or vice versa, then regenerate grub.cfg and try
> booting.

That's a good suggestion, except I don't see any way to do that in the
/etc/default/grub I have.

The closest thing I see is

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

but that says it's for grub-pc only, i.e. the "legacy" version of grub,
whereas I'm running grub2.

A bit of Googling suggests that

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

also supports a value of 'text' rather than a FOOxBAR resolution, but I
don't see that documented anywhere yet.

I don't expect such a change to be particularly risky, but I imagine if
I do somehow fail to boot after making it (e.g. if I specify a setting
that isn't actually supported), the solution would involve a live-boot
environment and possibly chrooting into the installed system.

> While in /etc/default/grub, if splash=silent is included, either
> remove it, or switch to splash=verbose.

It isn't.

From the little I've read up on regarding this in the meantime, I'd
expect this splash setting to be only regarding the post-GRUB-menu boot
process, which is beyond the point I've reached. For what it's worth,
I've long since intentionally disabled all "quiet" boot settings I'm
aware of.

> If the switch itself doesn't help, then try graphical after selecting
> some specific mode you know your display supports. I use
> video=1440x900 on cmdline most of the time for the vttys even when
> the display's native is 1920x1080, 1920x1200 or 2560x1440.

I'm not even getting to the GRUB command line; the hang is happening
before GRUB displays anything at all.

I may try specifying a resolution such as this to GRUB_GFXMODE, but I'm
not entirely certain that's relevant to the behavior I'm seeing,
although it would be plausible for it to be so.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230013

FromFelix Miata <mrmazda@earthlink.net>
Date2020-12-27 01:40 +0100
Message-ID<Bqsgh-1K9-7@gated-at.bofh.it>
In reply to#230010
The Wanderer composed on 2020-12-26 18:44 (UTC-0500):

> Felix Miata wrote:

>> I suggest a good place to start would be to goto /etc/default/grub
>> and switch from whichever mode is employed to the other, either plain
>> text to graphical, or vice versa, then regenerate grub.cfg and try
>> booting.

> That's a good suggestion, except I don't see any way to do that in the
> /etc/default/grub I have.

> The closest thing I see is

> # Uncomment to disable graphical terminal (grub-pc only)
> #GRUB_TERMINAL=console

> but that says it's for grub-pc only, i.e. the "legacy" version of grub,
> whereas I'm running grub2.

I know it says grub-pc only, but all mine are uncommented. And, all mine are on
UEFI installations. All my legacy BIOS installations boot from a custom partition
with Grub Legacy, which is used to boot every installation on the disk. It may be
that what it really means is: not arm*, not sparc, not mips, not ppc....

> A bit of Googling suggests that

> # The resolution used on graphical terminal
> # note that you can use only modes which your graphic card supports via VBE
> # you can see them in real GRUB with the command `vbeinfo'
> #GRUB_GFXMODE=640x480

Mine all are GRUB_GFXMODE="auto", but I have no AMD anything newer than about 6
years old.

> also supports a value of 'text' rather than a FOOxBAR resolution, but I
> don't see that documented anywhere yet.

I think what you can do is create /etc/grub.d/05_do-text containing:

	cat <<EOF
	  set textmode=true
	  terminal_output console
	EOF

It may be sufficient with only the first of the two. Textmode can be made optional
via hotkey:

	cat <<EOF
	hiddenentry 'Text mode' --hotkey 't' {
	  set textmode=true
	  terminal_output console
	}
	EOF
-- 
Evolution as taught in public schools, like religion,
	is based on faith, not on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#230021

FromSven Joachim <svenjoac@gmx.de>
Date2020-12-27 09:00 +0100
Message-ID<Bqz87-60R-17@gated-at.bofh.it>
In reply to#230010
On 2020-12-26 18:44 -0500, The Wanderer wrote:

> On 2020-12-26 at 18:28, Felix Miata wrote:
>
>> I suggest a good place to start would be to goto /etc/default/grub
>> and switch from whichever mode is employed to the other, either plain
>> text to graphical, or vice versa, then regenerate grub.cfg and try
>> booting.
>
> That's a good suggestion, except I don't see any way to do that in the
> /etc/default/grub I have.
>
> The closest thing I see is
>
> # Uncomment to disable graphical terminal (grub-pc only)
> #GRUB_TERMINAL=console
>
> but that says it's for grub-pc only, i.e. the "legacy" version of grub,
> whereas I'm running grub2.

No, grub-pc is not the legacy version of grub, it is grub2 for legacy
computers without EFI.  The version of grub2 for modern UEFI systems is
grub-efi-amd64 which uses the framebuffer set up by the system's
firmware (hence, no traditional text mode).

Cheers,
       Sven

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#230026

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 13:20 +0100
Message-ID<BqDbH-eX-3@gated-at.bofh.it>
In reply to#230021

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-27 at 02:51, Sven Joachim wrote:

> On 2020-12-26 18:44 -0500, The Wanderer wrote:
> 
>> On 2020-12-26 at 18:28, Felix Miata wrote:
>> 
>>> I suggest a good place to start would be to goto
>>> /etc/default/grub and switch from whichever mode is employed to
>>> the other, either plain text to graphical, or vice versa, then
>>> regenerate grub.cfg and try booting.
>> 
>> That's a good suggestion, except I don't see any way to do that in
>> the /etc/default/grub I have.
>> 
>> The closest thing I see is
>> 
>> # Uncomment to disable graphical terminal (grub-pc only) 
>> #GRUB_TERMINAL=console
>> 
>> but that says it's for grub-pc only, i.e. the "legacy" version of
>> grub, whereas I'm running grub2.
> 
> No, grub-pc is not the legacy version of grub, it is grub2 for
> legacy computers without EFI.  The version of grub2 for modern UEFI
> systems is grub-efi-amd64 which uses the framebuffer set up by the
> system's firmware (hence, no traditional text mode).

Ah, thanks for that correction; that does ring a bell now that you
mention it.

That would explain why this would be effective. I've made that change in
this file; as soon as I reach a point in my operations where shutting
down again is reasonable, I'll test to confirm that I can boot that way
with the old GPU (and what behavior difference there may be with that
change), and assuming it works will swap GPUs and see what I get.

I also want to make sure I have an up-to-date rescue environment on
external media, just in case I need to revert this change in order to
boot my current system again. Unlikely, but better to be safe than
sorry.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230027

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 16:30 +0100
Message-ID<BqG9z-1XY-5@gated-at.bofh.it>
In reply to#230026

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-27 at 07:10, The Wanderer wrote:

> On 2020-12-27 at 02:51, Sven Joachim wrote:
> 
>> On 2020-12-26 18:44 -0500, The Wanderer wrote:

>>> That's a good suggestion, except I don't see any way to do that
>>> in the /etc/default/grub I have.
>>> 
>>> The closest thing I see is
>>> 
>>> # Uncomment to disable graphical terminal (grub-pc only) 
>>> #GRUB_TERMINAL=console
>>> 
>>> but that says it's for grub-pc only, i.e. the "legacy" version
>>> of grub, whereas I'm running grub2.
>> 
>> No, grub-pc is not the legacy version of grub, it is grub2 for 
>> legacy computers without EFI.  The version of grub2 for modern
>> UEFI systems is grub-efi-amd64 which uses the framebuffer set up by
>> the system's firmware (hence, no traditional text mode).
> 
> Ah, thanks for that correction; that does ring a bell now that you 
> mention it.
> 
> That would explain why this would be effective. I've made that change
> in this file; as soon as I reach a point in my operations where
> shutting down again is reasonable, I'll test to confirm that I can
> boot that way with the old GPU (and what behavior difference there
> may be with that change), and assuming it works will swap GPUs and
> see what I get.

No joy. It works fine with the old GPU (better, actually, in that the
GRUB menu doesn't take several seconds to draw; the lower boot-menu
resolution is no hardship), but if anything the behavior with the new
GPU is *worse*; I think I got the keyboard freeze even earlier on my
first try with the new configuration, although it seems to have gone
back to happening at the handover on subsequent attempts,

I then went into the BIOS to check it over again, and found that an
option for "BIOS EHCI handoff" was set to enabled, with the apparent
meaning that the BIOS would take care of handing over USB EHCI control
to the booted system rather than relying on the OS to handle that. On
the presumption that modern Linux should be able to handle this itself,
I disabled that setting; my USB devices are working fine now with the
old GPU, but on the new it left me with no apparent change.

That may be worth paying more attention to: this isn't just a
black-screen hang, it's a more full-system hang. The keyboard lights
stay in whatever state they were in immediately prior to the handover,
and nothing responds to the keyboard at all.


I did also confirm that the BIOS version is 1402, which is the version
number of the final BIOS released for this motherboard back in 2012. If
the BIOS needing updates to work with this GPU is the problem, then I'm
SOL.

Still, again, if that were the problem I'd expect there to be no display
output during POST and in the BIOS...

I need to get that live-boot medium ready and do those tests.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230035

FromAnssi Saari <as@sci.fi>
Date2020-12-27 22:40 +0100
Message-ID<BqLVD-5Hj-1@gated-at.bofh.it>
In reply to#230027
The Wanderer <wanderer@fastmail.fm> writes:

> I need to get that live-boot medium ready and do those tests.

That seems like a good thing to do. Another thing you could do is post
your grub.cfg. It seems a little odd you haven't. Also from previous
discussion I think it's worth mentioning that Grub doesn't actually read
/etc/default/grub, update-grub reads it to generate
/boot/grub/grub.cfg. So only editing /etc/default/grub doesn't change
Grub config in any way.

If you're up for it, you could setup a serial terminal and send Grub
output to serial and/or console. That way you might be able to boot and
wouldn't have to switch video cards to try different configurations.
But if you only have that one computer then I guess not.

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#230036

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 23:10 +0100
Message-ID<BqMoF-68y-7@gated-at.bofh.it>
In reply to#230035

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-27 at 16:36, Anssi Saari wrote:

> The Wanderer <wanderer@fastmail.fm> writes:
> 
>> I need to get that live-boot medium ready and do those tests.
> 
> That seems like a good thing to do.

I have it ready now, but haven't shut down for another swap, in part
because I've been napping. I may do it tonight, or more likely, tomorrow.

> Another thing you could do is post your grub.cfg. It seems a little
> odd you haven't.

It mainly just hadn't occurred to me, in part (though only in part)
because I thought I recalled that the boot-configuration files for GRUB2
weren't the same as from legacy GRUB (and might even be stored in
multiple files) and had a mental association of that file with legacy
GRUB, so didn't trust it to necessarily be the correct / full config.

Now that it's been suggested, I have a bit of concern about posting a
file containing filesystem (and other related?) UUIDs; that's probably
excessive paranoia (last time I needed to post a file containing complex
IDs like that some of them were encryption-key hashes), but I've still
chosen to sed them out into generic form before attaching the result.
That's the only difference between the attachment and the original.

I don't expect there to be any useful / relevant information there, but
one never knows.

It occurs to me that it might be worthwhile to note down some
get-information commands from the GRUB documentation, and stop at the
GRUB menu next time I'm booting with the old / current GPU to see
whether I can extract anything that might be helpful.

> Also from previous discussion I think it's worth mentioning that Grub
> doesn't actually read /etc/default/grub, update-grub reads it to
> generate /boot/grub/grub.cfg. So only editing /etc/default/grub
> doesn't change Grub config in any way.

Yes, I know that much. After applying the change, I ran update-grub to
re-generate the config files appropriately.

> If you're up for it, you could setup a serial terminal and send Grub 
> output to serial and/or console. That way you might be able to boot
> and wouldn't have to switch video cards to try different
> configurations. But if you only have that one computer then I guess
> not.

We have at least a dozen computers in the household, if you count
servers and laptops, and AFAIK a plurality of them are Debian-based.
What we don't have is A: any experience with working with serial
console, or B: (that I know of) any cables that might work to connect
two computers that way.

I have the impression that things have by now developed to the point
where a physical serial-port cable (of the classic type of serial port
and cable, whose connectors can be visually confused with a VGA port in
some cases) is no longer necessary, which is good, since if we ever had
such a thing it was at least back in the days of PS/2 keyboards and mice
and might have been back in the days before our home computers had
internal hard drives.

I imagine USB would be the replacement (just based on the name), and I'm
also aware of the existence (kernel-side) of netconsole, but how to use
either for this I don't know.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230038

From<tomas@tuxteam.de>
Date2020-12-27 23:30 +0100
Message-ID<BqMI1-6fP-1@gated-at.bofh.it>
In reply to#230036

[Multipart message — attachments visible in raw view] — view raw

On Sun, Dec 27, 2020 at 05:08:27PM -0500, The Wanderer wrote:

[...]

> I have the impression that things have by now developed to the point
> where a physical serial-port cable (of the classic type of serial port
> and cable, whose connectors can be visually confused with a VGA port in
> some cases) is no longer necessary, which is good, since if we ever had
> such a thing it was at least back in the days of PS/2 keyboards and mice
> and might have been back in the days before our home computers had
> internal hard drives.

"Modern" computers tend to lack serial ports (sometimes a pity, but
well...)

Still I doubt it would be any help. You made a credible case that
there is a hard lockdown at the handover from the BIOS to GRUB.
You'd have to be very lucky for GRUB to utter a last sigh over
serial before that.

My impression is that the video card reacts allergically to some
modeset attempt by GRUB and this causes a pretty low level lockup.

Cheers
 - t

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#230039

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-27 23:40 +0100
Message-ID<BqMRH-6jm-1@gated-at.bofh.it>
In reply to#230038

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-27 at 17:23, tomas@tuxteam.de wrote:

> On Sun, Dec 27, 2020 at 05:08:27PM -0500, The Wanderer wrote:
> 
> [...]
> 
>> I have the impression that things have by now developed to the
>> point where a physical serial-port cable (of the classic type of
>> serial port and cable, whose connectors can be visually confused
>> with a VGA port in some cases) is no longer necessary, which is
>> good, since if we ever had such a thing it was at least back in the
>> days of PS/2 keyboards and mice and might have been back in the
>> days before our home computers had internal hard drives.
> 
> "Modern" computers tend to lack serial ports (sometimes a pity, but 
> well...)
> 
> Still I doubt it would be any help. You made a credible case that 
> there is a hard lockdown at the handover from the BIOS to GRUB. You'd
> have to be very lucky for GRUB to utter a last sigh over serial
> before that.
> 
> My impression is that the video card reacts allergically to some 
> modeset attempt by GRUB and this causes a pretty low level lockup.

I've had similar thoughts, but if that were the case, I'd expect that
telling GRUB to use "console" output would avoid the problem, by having
it not do any modesetting. My most recent attempt was with
terminal_input and terminal_output set to "console", and the problem
persisted.

I do see various modules listed in the grub.cfg load_video function, and
it's not impossible that the process of trying to use one or more of
those includes some action which triggers this behavior. I haven't found
a place to configure that, though - or I hadn't until now; it's in
/etc/grub.d/00_header, and can be overridden to a single module by
defining GRUB_VIDEO_BACKEND (presumably, in /etc/default/grub).

I might pursue that if the live-boot environment doesn't give fruitful
results.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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#230043

FromAndrei POPESCU <andreimpopescu@gmail.com>
Date2020-12-28 09:20 +0100
Message-ID<BqVUZ-3W5-7@gated-at.bofh.it>
In reply to#230039

[Multipart message — attachments visible in raw view] — view raw

On Du, 27 dec 20, 17:31:37, The Wanderer wrote:
> 
> I do see various modules listed in the grub.cfg load_video function, and
> it's not impossible that the process of trying to use one or more of
> those includes some action which triggers this behavior. I haven't found
> a place to configure that, though - or I hadn't until now; it's in
> /etc/grub.d/00_header, and can be overridden to a single module by
> defining GRUB_VIDEO_BACKEND (presumably, in /etc/default/grub).

For testing purposes you could just edit grub.cfg, even if your changes 
will be overridden on the next 'update-grub'.

At least you'll know if it's a path worth pursuing.

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#230050

FromAnssi Saari <as@sci.fi>
Date2020-12-28 13:50 +0100
Message-ID<Br08h-6HP-7@gated-at.bofh.it>
In reply to#230036
The Wanderer <wanderer@fastmail.fm> writes:

> On 2020-12-27 at 16:36, Anssi Saari wrote:
>
>> The Wanderer <wanderer@fastmail.fm> writes:
>> 
>>> I need to get that live-boot medium ready and do those tests.
>> 
>> That seems like a good thing to do.
>
> I have it ready now, but haven't shut down for another swap, in part
> because I've been napping. I may do it tonight, or more likely, tomorrow.
>
>> Another thing you could do is post your grub.cfg. It seems a little
>> odd you haven't.
>
> It mainly just hadn't occurred to me, in part (though only in part)
> because I thought I recalled that the boot-configuration files for GRUB2
> weren't the same as from legacy GRUB (and might even be stored in
> multiple files) and had a mental association of that file with legacy
> GRUB, so didn't trust it to necessarily be the correct / full config.

Well, as I recall from the past, old Grub used /boot/grub/menu.lst. I
still have one of those around dated Aug 14 2016. Not sure that's an
accurate date but I can't remember my bootloader history, other than I
stuck with LILO for a very long time.

Anyways, I don't see much anything in the grub.cfg. Maybe the video
options but it seems to be pretty much the default and that doesn't seem
to cause issues very often, at least I couldn't find any Grub crashes
with specifically AMD cards or any hardware.

One thing came to my mind, do you have the appropriate aux power
connectors available and connected? Looks like the RX 5700 XT is quite
power hungry at 225 W max vs. 151 W with your old card. Different
connectors too (6 pin + 8 pin instead of 2x 6 pin). And these cards can
be quite picky about having appropriate power connected.

> I have the impression that things have by now developed to the point
> where a physical serial-port cable (of the classic type of serial port
> and cable, whose connectors can be visually confused with a VGA port in
> some cases) is no longer necessary, which is good, since if we ever had
> such a thing it was at least back in the days of PS/2 keyboards and mice
> and might have been back in the days before our home computers had
> internal hard drives.

Not quite that long ago.

> I imagine USB would be the replacement (just based on the name), and I'm
> also aware of the existence (kernel-side) of netconsole, but how to use
> either for this I don't know.

I've never tried it but as I understand it, Grub has some support for
USB-serial adapters. After all, Grub has to support USB keyboards which
means the basic building blocks of USB support have to be there. Adding
support for USB-serial isn't that hard after that. But yes, this was a
long shot anyways.

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#230051

FromThe Wanderer <wanderer@fastmail.fm>
Date2020-12-28 14:00 +0100
Message-ID<Br0hX-6LY-3@gated-at.bofh.it>
In reply to#230050

[Multipart message — attachments visible in raw view] — view raw

On 2020-12-28 at 07:47, Anssi Saari wrote:

> One thing came to my mind, do you have the appropriate aux power 
> connectors available and connected? Looks like the RX 5700 XT is
> quite power hungry at 225 W max vs. 151 W with your old card.
> Different connectors too (6 pin + 8 pin instead of 2x 6 pin). And
> these cards can be quite picky about having appropriate power
> connected.

Yes - I noted the different power-connector requirements when I first
installed the card, and I've had them in place on every swap-in since.

If the card weren't getting its proper power, I'd expect anything from
no video output at all to a warning light to a motherboard beep, none of
which is happening.

My PSU is overpowered for the system it's in, so I'm reasonably sure
it's capable of handling the added load for the upgraded GPU without
issues.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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