https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #134 from Jan Ziak 0xe2.0x9a.0x9b@gmail.com --- (In reply to Chris Waters from comment #133)
I decided to record how my system behaves when using Linux and my 390 together.
This is what I see https://www.youtube.com/watch?v=9uVIzHFlTZk
This is Ubuntu MATE 16.10 with Firefox open¹, something that is not at all graphically intensive. On KDE Plasma 5 it's even worse, my entire system will sometimes crash. It's completely unusable and I'm stuck on Windows because of this.
¹ I know there is a tab that says "Chrome Experiments", but it's unloaded. I tried loading one to see what would happen if I tried something a bit intensive, but my entire system crashed. Ended up having to restart recovered my session in Firefox.
This look the same for other 390 users?
The video is similar to what I am seeing, in the video it is more severe.
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If the following commands are executable on your machine:
$ ls -d /sys/class/drm/card? /sys/class/drm/card0 /sys/class/drm/card1
$ cat /sys/class/drm/card1/device/pp_dpm_sclk 0: 300Mhz * 1: 500Mhz 2: 698Mhz 3: 858Mhz 4: 899Mhz 5: 935Mhz 6: 969Mhz 7: 1000Mhz
then (question) does the flickering go away if you run:
$ echo 1234567 > /sys/class/drm/card1/device/pp_dpm_sclk