Problem with multiple x-screens since driver-version 435 (manjaro,RTX-2060)

Graphics / Linux Linux
1

hello there,
driver 435 and 440 wont allow me to configure multiple xscreens (as in chapter 14 of documentation) anymore
…works well until version 430, but above 430 the second x-screen is ignored…

the Xorg.0.log throws the following errors:

[ 7.539] (EE) NVIDIA(G0): GeForce RTX 2060 (GPU-0) already has an X screen assigned;
[ 7.539] (EE) NVIDIA(G0): skipping this GPU screen
[ 7.539] (EE) NVIDIA(G0): Failing initialization of X screen

im on manjaro linux using a RTX-2060 card
…any ideas what is wrong?

greetings and thanks,
florian

nvidia-bug-report.log (582.8 KB)

2

/usr/share/X11/xorg.conf.d/10-amdgpu-nvidia-drm-outputclass.conf
has
Option “AllowNVIDIAGPUScreens”
set which is for render offload on optimus systems. Please remove it since then only one gpu screen per gpu is allowed.
Furthermore, please remove
/etc/X11/xorg.conf.d/90-mhwd.conf
since it defines yet another config.

3

oh hi, thanks for the reply!
i did all that… (removed 90-mhwd.conf and AllowNVIDIAGPUScreens) unfortunately it didnt help :-(
still the same error msg in Xorg.0.log. i attached the new nvidia-bug-report…

thanks and greetings,
florian

nvidia-bug-report.log (576.2 KB) log

4

/usr/share/X11/xorg.conf.d/10-intel-nvidia-drm-outputclass.conf
also contains it, please remove, try again.

5

hmm, ok did that… no, still same problem :-(
attached another log…
thanks, florian
nvidia-bug-report.log (626.2 KB)

6

I think the problem here is not necessarily the AllowNVIDIAGPUScreens option itself, but the fact that it requires a ServerLayout section to specify it. There’s a known issue with the X server where it will prefer a server layout it finds in xorg.conf.d/* over one you specify yourself in /etc/X11/xorg.conf. So even though your layout named Layout0 has two X screens, the server is using the one named layout that it’s finding in /usr/share/X11/xorg.conf.d/10-amdgpu-nvidia-drm-outputclass.conf that has an implicit one-screen layout. This causes the server to create a GPU screen for the other Device section you specified in xorg.conf.

I think you’ll need to delete the ServerLayout sections in /usr/share/X11/xorg.conf.d/* before your custom layout will be used. Alternatively, you should be able to start the X server with the -layout Layout0 option to choose your layout explicitly.

A future driver release will enable AllowNVIDIAGPUScreens by default on xserver 1.20.7 and newer so hopefully this problem will go away relatively soon.

7

wow, removed all ServerLayouts except mine and… indeed that worked :-)

thanks a lot!