https://bugs.freedesktop.org/show_bug.cgi?id=101053

            Bug ID: 101053
           Summary: DC R9 285 fullscreen video regression since
                    drm/amd/display: Parse scanline registers
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com

R9 285 tonga since

commit afbeb2d0961b2139bcf6553a710e6a8ae5d09d34
Author: Sylvia Tsai <sylvia.tsai@amd.com>
Date:   Tue Apr 11 15:15:28 2017 -0400

    drm/amd/display: Parse scanline registers

    They could differ between ASIC generations

    Change-Id: Ia352ae206273fe3a025579554cae4e3711a26fcc

on agd5f drm staging 4.9/11 there is a regression with full screen video.

mpv --vo=vaapi/vdpau/opengl all the same, dropping frames, or playing slowmo
with --framedrop=no

Windowed playback is OK, testing with 60fps vid on 60Hz DVI-D display.

Forcing clocks high does not help.

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