Comment # 8 on bug 105251 from dxxf@volny.cz

For me its hang immediately at boot (as soon as Xorg loads). Only way I was
able to successfully boot the machine is setting: "NoAccel" "True" in
Xorg.conf.d/10-amdgpu.conf.
In some cases there is nothing in dmesg or Xorg.0.log machine just hangs with
"cursor" on the screen.