When I use modest quality settings in mpv (0.28.0), the result=
is stuttery when
power_dpm_force_performance_level =3D auto.
The stuttering completely disappears when I set
power_dpm_force_performance_level =3D high.
Modest mpv settings would be these:
profile=3Dgpu-hq
video-sync=3Ddisplay-resample
interpolation
tscale=3Dlinear
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 regardl=
ess
of refreshrate or timings).
(my first report here, so plz don't tear it apart in case something's not to
your satisfaction)