AMDGPU: RX 6500 XT: System reset when loading module [SOLVED]

[Cal Peake]

Hi all,

I wanted to put a capper on this just in case anyone was interested, or in 
case any future people find this thread, because I did find a resolution.

Turns out the way to stop the system from crashing was to disable Global 
C-State Control in the BIOS.

Christian, Alex, you guys seem to have been on the right track in that it 
was something power related.

I haven't yet been able to figure out what Global C-State Control exactly 
does.

My best guess as to what was happening: once the GPU power management code 
was loaded and the GPU dropped into a very low power state, the CPU saw 
this and decided to match it, lowering its own power state to such a point 
that it hard resets the system. (Just a wild theory anyway :-)

If anyone knows what this feature really does, or has any better theories 
as to why it doesn't play nice with AMD GPUs, please do share!

Thanks and kind regards,

-- 
Cal Peake