[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 #135 from Jan Ziak <0xe2.0x9a.0x9b at gmail.com> ---
(In reply to Jan Ziak from comment #134)
> (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

Correction:

$ echo manual > sys/class/drm/card1/device/power_dpm_force_performance_level
$ echo 1234567 > /sys/class/drm/card1/device/pp_dpm_sclk

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