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Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics

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  Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics Dan Ritter <dsr@randomstring.org> - 2020-06-24 16:30 +0200
    Re: [External]  Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon  Graphics Dan Ritter <dsr@randomstring.org> - 2020-06-24 18:20 +0200
      Re: [External]  Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon  Graphics Greg Wooledge <wooledg@eeg.ccf.org> - 2020-06-24 18:40 +0200
        Re: [External]  Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon  Graphics Dan Ritter <dsr@randomstring.org> - 2020-06-24 19:50 +0200

#223956 — Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics

Curtis Tucker1 wrote: 
> Hi,
> 
> After installing firmware-bullseye + xserver-xorg-video-amdgpu + firmware-amd-graphics on an AMD Ryzen 7 Pro + Radeon Graphics platform, there is no dual monitor capability via HDMI.
> 
> I thought the amdgpu from xorg would take care of things like xinerama or twinview.

At this point, you should be able to do this with xrandr, or any
of the frontend substitutes.

What does 

xrandr |grep connect  

give you? From an xterm or similar, please.

-dsr-

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#223958 — Re: [External] Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics

Curtis Tucker1 wrote: 
> Hi Dan,
> 
> "xrandr | grep connect" output:
> 
> xrandr: Failed to get size of gamma for output default
> default connected  primary 1920x1080+0+0 0mm  x  0mm

That suggests that your X server is not actually using the
amdgpu driver.

Here's one of mine, using amdgpu:

DisplayPort-0 connected 3840x2160+0+0 (normal left inverted
right x axis y axis) 953mm x 543mm
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)


Check for a very recent file called: 
/var/log/Xorg.0.log

and start reading at the top. This should describe what happened
in your most recent X session, and include items looking for
your video card and eventually settling on a driver that fits it.

If it isn't amdgpu, we'll need to convince your X server to use
it.

-dsr-

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#223959 — Re: [External] Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics

On Wed, Jun 24, 2020 at 12:16:27PM -0400, Dan Ritter wrote:
> Check for a very recent file called: 
> /var/log/Xorg.0.log

Starting in Debian 9, the Xorg log file can be in two different places.
Either there, or ~/.local/share/xorg/Xorg.0.log .

Be sure to look for both, and use the one that's actually current.

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#223963 — Re: [External] Re: No Dual Monitors on AMD Ryzen 7 Pro + Radeon Graphics

Curtis Tucker1 wrote: 
> No output in "~/.local", but I'll keep that in mind for future reference.  I am starting to see that directory used more often, eg, fonts.
> 
> Looking at the log in "/var/log", is loads the Radeon module, but then unloads it because it cannot find the right chipset on the board.  The same for the fallback "fbdev/fbdevhw" because it could not find a framebuffer.  Finally, it settles on "int10", makes a call into BIOS to initialize the GPU display as VESA with extensions VBE.  Next it starts to configure other associated devices/components, ie, events, kb, touch screen, camera, etc., & hands over to udev control of HDMI/DP & HD audio/digital because it couldn't find any drivers.
> 
> BTW:  I posted this question before I discovered that there was no xorg.conf.
> 

OK. The driver you actually want is "amdgpu", not "radeon" and
definitely not VESA.

Set that in xorg.conf and you should have full access to all
your screens.

-dsr-

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