Bug#903541: nvidia-driver: Nvidia-driver 390-67 displays SDDM black screen

[Vojtech Bocek]

Hello,
I'm assuming the bug report in your message is from the PC where it is
working, since the Xorg.0.log contains only HD monitor.
Try adding contents of /etc/nvidia/nvidia-drm-outputclass.conf (installed
by xserver-xorg-video-nvidia) into your Xorg.conf.
For me, the issue was that libglx from xorg was loaded instead of the one
by Nvidia, and this fixed it.

I think the xserver-xorg-video-nvidia is supposed to be adding those config
lines automatically, but it is not.
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