https://bugs.freedesktop.org/show_bug.cgi?id=101029
--- Comment #10 from Michel Dänzer michel@daenzer.net --- Okay, I guess we need to try another trick: Boot with
modprobe.blacklist=amdgpu
on the kernel command line to prevent the amdgpu module from being loaded automatically. Once the system is booted up, manually run
sudo modprobe amdgpu
This should increase the chance of capturing the dmesg output somewhere.