Without amdgpu.dcdebugmask=0x210, I get the DMUB error the first time that I remove the usb-c wireless hdmi transmitter. (I never get to disconnect the transmitter a second time because the computer is unusable after this.) With the kernel option, I get the error when I plug the transmitter back in after removing it. This is using NixOS 24.11, kernel 6.11.x (as well as 6.6.x) and Gnome 47