Additionally you can try and force use amdgpu rather than radeon, by setting the kernel flags:

radeon.cik_support=0 radeon.si_support=0 amdgpu.cik_support=1 amdgpu.si_support=1 amdgpu.dc=1

Source

Device initalization failed according to the Xorg logs;

1. Dump your firmware version
2. Dump your kernel version
3. Dump your kernel logs (dmesg or journalctl -k)

Nice, then you should be able to run vkcube to verify whether your GPU is activated properly.

You can do several "iterations" here as well.

1. Install Mangohud so you can visibly see if your GPU is activated correctly
2. Run mangohud vkcube-wayland - Does it use your Nvidia GPU?
3. Run mangohud vkcube - Does it use your Nvidia GPU?

If Step 2 nor 3 shows your Nvidia GPU you can try and force it with: mangohud vkcube-wayland --gpu_number 0

Breaking Linux every week or every other week? That's almost impressive!