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Nvidia driver and linux 6.11 phantom monitor

Description:

With the latest nvidia driver and linux 6.11 a phantom screen called unknown "39 is under gnome and from the testing forum (viewtopic.php?id=299450) it happens on other compositors also. I noticed simpledrm was initialized early and that creates 2 gfx cards under /dev/dri and this did not happen on 6.10.

I also had cachyos 6.11 installed and that had no issues. and i think i found the culprit and its in the config parameter: CONFIG_SYSFB_SIMPLEFB=y on cachyos this is not set and it defaults to "n"

I have tested with this not set or set to "n" and then the issue is gone.

Additional info:

  • nvidia-dkms 560.35.03-2
  • linux 6.11.arch1-1
  • boot parameters: options root=.. quiet splash nvidia-drm.modeset=1 nvidia-drm.fbdev=1 nvidia.NVreg_EnableGpuFirmware=0
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