[Bug 104555] RX 560 DPM auto - driver doesn't reliably set high clocks, causing stutter in mpv - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 104555] RX 560 DPM auto - driver doesn't reliably set high clocks, causing stutter in mpv
Date: Tue, 09 Jan 2018 12:21:15 +0000	[thread overview]
Message-ID: <bug-104555-502@http.bugs.freedesktop.org/> (raw)

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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)

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