After a recent update, when I boot NixOS the screen goes black just before the login screen. I've rolled back to the last generation that worked, but I'd really like to actually fix the issue. This seems to be the relevant error message, so apparently an issue with the AMD GPU driver:
kernel: [drm:dc_dmub_srv_cmd_run_list [amdgpu]] *ERROR* Error queueing DMUB command: status=2
Any ideas?