Created attachment 142330 [details]
amdgpu.ppfeaturemask=0xfffdbfff lockup during normal usage

I did more testing on amdgpu.ppfeaturemask=0xfffdbfff, and I just got the gpu
lockup while browsing the web. I am going to do further testing of the other
command line option to see if that will trigger any freezes during more
extended usage. But it looks like 0xfffdbfff is confirmed as triggering the
bug.