Bug 104555

Summary: RX 560 DPM auto - driver doesn't reliably set high clocks, causing stutter in mpv
Product: DRI Reporter: tempel.julian
Component: DRM/AMDgpuAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description tempel.julian 2018-01-09 12:21:15 UTC 
When I use modest quality settings in mpv (0.28.0), the result is stuttery when power_dpm_force_performance_level = auto.
The stuttering completely disappears when I set power_dpm_force_performance_level = high.

Modest mpv settings would be these:
profile=gpu-hq
video-sync=display-resample
interpolation
tscale=linear

The stuttering isn't recognized by mpv's stats, so we unfortunately have to judge with eyes (thus cheap interpolation is enabled, so result should be smooth regardless of refreshrate).
It's very obvious with camera pans and it's most severe when I do any 2160p 60fps video downscaling to 1440p (in fullscreen on Xorg without compositor).

This happens with Linux 4.14.12 and 4.15 RC7, I didn't test older kernels.

Display is 2560x1440 75Hz, but it also happens at 60Hz (so probably regardless of refreshrate or timings).

(my first report here, so plz don't tear it apart in case something's not to your satisfaction)
Comment 1 tempel.julian 2018-02-27 20:53:08 UTC 
This seems to be fixed with amd-staging-drm-next-git for Linux 4.17.
Clocking looks a bit aggressive, but it seems to be really worth it as every GPU accelerated UI us entirely stutter-free now. Please keep it that way, it still saves enough power when the system is idle!
I wished the clocking behavior on Windows was the same, I'd consider behavior on Windows totally broken with partial load (stuttering everywhere).
Comment 2 tempel.julian 2018-06-04 09:36:54 UTC 
Still fixed in Linux 4.17, closing.

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