Fedora won't boot afater kernel 6.3.12

[kparal (Kamil Páral)]

This might be the same issue as this one. See my advice there, please report a bug against kernel.

@stevelauc

Jul 25 08:27:18 fedora kernel: [drm:dc_dmub_srv_wait_idle [amdgpu]] ERROR Error waiting for DMUB idle: status=3

Yes, I would expect this to be a likely cause of the problem.