[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #134 from Jan Ziak <0xe2.0x9a.0x9b at 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.

----

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

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