Comment # 9 on bug 1190854 from Hadrien Grasland

FWIW, I keep wondering about this power management error near the start of the
amdgpu initialization logs:

 769   ��������� [    4.101984] amdgpu 0000:01:00.0: can't change power state from
D3cold to D0 (config space inaccessible)

I don't know enough about PCI and ACPI power management to tell how serious
this is, but intuitively "config space inacessible" sounds bad... and if I
randomly search the web for "can't change power state from D3cold to D0 (config
space inaccessible)", I find various interesting-looking discussion threads,
several of which concern hardware initialization problems at boot.

Unfortunately, however, most of these threads are about hardware other than AMD
GPUs, and they contain more questions than answers.