Created attachment 142294 [details]
With radeon.cik_support=0 and amdgpu.cik_support=1, I get a blank screen on Linux 4.19.0. This worked fine on 4.18.16. Machine is still accessible via SSH, but will not shut down successfully.
Using radeon instead of amdgpu is a work-around.
By the function names I'm guessing it's UVD/PowerPlay related, but this is out of my realm of troubleshooting expertise.
Attached dmesg snippet with traces and detailed error messages.
Please attach your full dmesg output. Can you bisect?
Sure. I'll see if I can turn off all this 'audit' nonsense that's filling dmesg with the names of files and users on my PC that I don't want all over the internet.
Haven't built a kernel from source in ages and never done a git bisect on one. I'll give it a try though.
Created attachment 142312 [details]
Full dmesg output after crash
I think this patch should fix at least some of the issues:
It works! Mostly.
Everything seems to run fine until after a suspend/resume, after which i get scrambled gibberish on one monitor (DisplayPort-0) and nothing on the other two (DVI-D-0,1).
xrandr --output DVI-D-0 --off --output DVI-D-1 --off gets things looking normal again on DisplayPort-0, but re-enabling either of those displays doesn't work and brings back the gibberish.
Created attachment 142377 [details]
dmesg after suspend/resume
I guess we might as well close this out, since it sort of works now and the display corruption is a different issue.