https://bugs.freedesktop.org/show_bug.cgi?id=104555

Bug ID: 104555 Summary: RX 560 DPM auto - driver doesn't reliably set high clocks, causing stutter in mpv Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: major Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: tempel.julian@gmail.com

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)