Incorrect GPU selection for session

[flukejones]

I have a new laptop with AMD and NVIDIA GPU. The AMD gpu is the iGPU. However there are a few issues:

1. The Nvidia GPU is before the AMD on the PCI bus

65:00.0 VGA compatible controller: NVIDIA Corporation AD106M [GeForce RTX 4070 Max-Q / Mobile] (rev a1)
66:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Strix [Radeon 880M / 890M] (rev c1)

2. The Nvidia GPU is marked as boot_vga

3. This causes the dGPU to be in consistent use and never suspend. It will suspend if switched to a TTY and desktops stopped.

The issue isn't solely cosmic-comp. Gnome is affected also. However if I work around the issue with nvidia_drm.modeset=0 this prevents gnome grabbing the card, but makes cosmic crash as it tries to use card0 with now doesn't have DRM ability.

Related issue on drm/amd

[Quackdoc]

temporary fix should be COSMIC_RENDER_DEVICE=/dev/dri/renderD1## env var? I believe COSMIC_RENDER_AUTO_ASSIGN=y may also be warranted.

[flukejones]

Unfortunately that does not help. Still selects incorrect gpu