for anyone else still trapped on NixOS, it seems 25.11 has broken a bunch of amdgpu stuff. this might apply only to older Radeon cards, I’m not sure (and neither is anyone still working on nix, cause nobody cared enough to check) but if you’re noticing:
- stuttering/screen freezes
- driver crashes
- your VT locking up when switching between a graphical and a text session or during modesetting
then the only solution I’ve found is to revert back to 25.05