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)
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).
Still fixed in Linux 4.17, closing.
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