Created attachment 142319 [details]
amdgpu.ppfeaturemask=0xffff3fff resume from suspend lockup

Alex,
So far it seems that I am not getting the gpu lockup I had previously with
either amdgpu.ppfeaturemask=0xfffdbfff or amdgpu.ppfeaturemask=0xffff3fff. I
tested again and I still get the gpu lockup without these options (this is
without having any commit reverted).

I will try your patch and test that now.

NOTE: While using amdgpu.ppfeaturemask=0xffff3fff I had a graphics lockup on
resume from suspend, with messages I don't remember seeing before. May or may
not be related to the current issue.

NOTE2: I didn't mention it before, but I have a systemd hook which disables C6
states prior to suspend and enables them again after suspend. The reason for
this is it fixes GPU lockups I have gotten on resume. (May be relevant to this
current bug or could be unrelated, I'm not sure how the state of the CPU
affects the GPU…).