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Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660

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  Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Salvatore Bonaccorso <carnil@debian.org> - 2025-09-18 07:50 +0200
    Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Jose M Calhariz <jose.calhariz@tecnico.ulisboa.pt> - 2025-09-22 20:00 +0200
      Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Jose M Calhariz <jose.calhariz@tecnico.ulisboa.pt> - 2025-09-24 18:30 +0200
        Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Salvatore Bonaccorso <carnil@debian.org> - 2025-09-24 18:50 +0200

#89310 — Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660

Control: tags -1 + moreinfo

Hi Jose,

On Mon, Dec 30, 2024 at 03:53:03PM +0000, Jose M Calhariz wrote:
> Package: src:linux
> Version: 6.11.10-1~bpo12+1
> Severity: normal
> 
> I found that this kernel fails to setup the video mode of the display
> adapter, where a kernel 6.1 seams to work, on a server Dell PowerEdge
> R660.  The work around is to use mgag200.modeset=0.  This machine is
> to be used as a server, no graphics, X11 or Wayland, just text console
> after a boot from UEFI.  But I need iDRAC, BMC from dell or IPMI, to
> sucessfully export the console of the machine to be managed when SSH
> fails.
> 
> I am open to do more tests or give more information as I understand an
> R660 may not be available to the Debian Kernel Team.

Is this something you still can reproduce with current kernels, so
6.12.43-1~bpo12+1?

Can you easily take out the server for maintenance, and so do further
experiments, assuming you can reproduce it with 6.12.43 based kernel,
does 6.16.7-1 as well still expose the problem?

If yes: Can you bisect the changes between 6.1 upstream and 6.11
upstream to identify the commit which changes things for you? (do you
need instructions on how to proceed on bisection?).

Regards,
Salvatore

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#89354

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

Hi Salvatore,

I have some servers of this type and in the next weeks I will put two
more in production.  So I will try:

 * Latest kernel from backports for bookworm.
 * If fail, try lastest from unstable,
 * If fail, try with upstream kernel.

Then we talk about bisect the upstream kernel with the previous
knowledge.


On Thu, Sep 18, 2025 at 07:43:53AM +0200, Salvatore Bonaccorso wrote:
> Control: tags -1 + moreinfo
> 
> Hi Jose,
> 
> On Mon, Dec 30, 2024 at 03:53:03PM +0000, Jose M Calhariz wrote:
> > Package: src:linux
> > Version: 6.11.10-1~bpo12+1
> > Severity: normal
> > 
> > I found that this kernel fails to setup the video mode of the display
> > adapter, where a kernel 6.1 seams to work, on a server Dell PowerEdge
> > R660.  The work around is to use mgag200.modeset=0.  This machine is
> > to be used as a server, no graphics, X11 or Wayland, just text console
> > after a boot from UEFI.  But I need iDRAC, BMC from dell or IPMI, to
> > sucessfully export the console of the machine to be managed when SSH
> > fails.
> > 
> > I am open to do more tests or give more information as I understand an
> > R660 may not be available to the Debian Kernel Team.
> 
> Is this something you still can reproduce with current kernels, so
> 6.12.43-1~bpo12+1?
> 
> Can you easily take out the server for maintenance, and so do further
> experiments, assuming you can reproduce it with 6.12.43 based kernel,
> does 6.16.7-1 as well still expose the problem?
> 
> If yes: Can you bisect the changes between 6.1 upstream and 6.11
> upstream to identify the commit which changes things for you? (do you
> need instructions on how to proceed on bisection?).
> 
> Regards,
> Salvatore
> 

Kind regards
Jose M Calhariz


-- 
--
	As utopias sao, muitas vezes, verdades prematuras.
		-- Lamartine

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#89391

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

Hi,

I have tried with two new kernels from backports and now works.
Kernels names:

linux-image-6.12.32+bpo-amd64    6.12.32-1~bpo12+1
linux-image-6.12.43+deb12-amd64  6.12.43-1~bpo12+1

This R660 will wait some more days before going to production.  Want
me to try more kernels?


Kind regards
Jose M Calhariz


On Mon, Sep 22, 2025 at 06:56:51PM +0100, Jose M Calhariz wrote:
> Hi Salvatore,
> 
> I have some servers of this type and in the next weeks I will put two
> more in production.  So I will try:
> 
>  * Latest kernel from backports for bookworm.
>  * If fail, try lastest from unstable,
>  * If fail, try with upstream kernel.
> 
> Then we talk about bisect the upstream kernel with the previous
> knowledge.
> 
> 
> On Thu, Sep 18, 2025 at 07:43:53AM +0200, Salvatore Bonaccorso wrote:
> > Control: tags -1 + moreinfo
> > 
> > Hi Jose,
> > 
> > On Mon, Dec 30, 2024 at 03:53:03PM +0000, Jose M Calhariz wrote:
> > > Package: src:linux
> > > Version: 6.11.10-1~bpo12+1
> > > Severity: normal
> > > 
> > > I found that this kernel fails to setup the video mode of the display
> > > adapter, where a kernel 6.1 seams to work, on a server Dell PowerEdge
> > > R660.  The work around is to use mgag200.modeset=0.  This machine is
> > > to be used as a server, no graphics, X11 or Wayland, just text console
> > > after a boot from UEFI.  But I need iDRAC, BMC from dell or IPMI, to
> > > sucessfully export the console of the machine to be managed when SSH
> > > fails.
> > > 
> > > I am open to do more tests or give more information as I understand an
> > > R660 may not be available to the Debian Kernel Team.
> > 
> > Is this something you still can reproduce with current kernels, so
> > 6.12.43-1~bpo12+1?
> > 
> > Can you easily take out the server for maintenance, and so do further
> > experiments, assuming you can reproduce it with 6.12.43 based kernel,
> > does 6.16.7-1 as well still expose the problem?
> > 
> > If yes: Can you bisect the changes between 6.1 upstream and 6.11
> > upstream to identify the commit which changes things for you? (do you
> > need instructions on how to proceed on bisection?).
> > 
> > Regards,
> > Salvatore
> > 
> 
> Kind regards
> Jose M Calhariz
> 
> 



-- 
--
	As utopias sao, muitas vezes, verdades prematuras.
		-- Lamartine

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#89392

Source: linux
Source-Version: 6.12.43-1~bpo12+1

Hi Jose,

On Wed, Sep 24, 2025 at 05:26:51PM +0100, Jose M Calhariz wrote:
> Hi,
> 
> I have tried with two new kernels from backports and now works.
> Kernels names:
> 
> linux-image-6.12.32+bpo-amd64    6.12.32-1~bpo12+1
> linux-image-6.12.43+deb12-amd64  6.12.43-1~bpo12+1
> 
> This R660 will wait some more days before going to production.  Want
> me to try more kernels?

As this works with current bpo kernels now, then I think we are fine
and there is nothing more to be done.

If feasible I would suggest to go to Debian trixie for production.

Regards,
Salvatore

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