Nvidia, please get it together with external monitors on Wayland

Graphics / Linux Linux
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152

Comparing to a dedicated gamescope session makes this issue very obvious.

My setup:

  • 3440x1440 @ 100hz external monitor plugged directly into an eGPU via displayport.
  • eGPU connected to framework 13 (ryzen AI 350).
  • Internal display is 2.8k @ 120hz.
  • Nixos-unstable.
  • Nvidia 610.43.03.

With two sessions, a dedicated gamescope session and a normal cosmic desktop session.

  • The gamescope session is set to use the eGPU as the preferred device, and to output only to the external monitor.
  • The cosmic session is all defaults. Both monitors available, nothing fancy.

Running vkcube in each session:

  • Gamescope:
    • 100FPS on the external monitor at full screen.
    • Windowed not available to test in this configuration.
    • Internal monitor not available to test in this configuration.
  • Cosmic:
    • 30FPS on the external monitor at fullscreen.
    • 50FPS on the external monitor at half of screen.
    • 100FPS on the external monitor at quarter of screen.
    • 120FPS on internal monitor at full screen.

Mangohud in all cases is showing the eGPU being used, so it’s not a GPU selection issue. I suspect the issue is probably with some critical piece of data getting stored on system memory instead of vram maybe? And a dedicated gamescope session avoids the issue because it hides the iGPU entirely? Just a guess.