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

[Paul Menzel]

Dear Cal,


Am 12.04.22 um 00:31 schrieb Cal Peake:

> 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.

Yes, that is very much appreciated.

> 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!

It might be related to bug report *Random Soft Lockup on new Ryzen 
build* [1], and the referenced issues there. It’d be great if you could 
post here or there a summary with your system details (especially the 
system and GPU firmware versions).

Me is still a little upset, how AMD has until now not been able to 
properly analyze and fix this (with the ODMs).


Kind regards,

Paul


[1]: https://bugzilla.kernel.org/show_bug.cgi?id=196683