P.S. This might also be a security issue. I've noticed that the frame
that's stuck inside the flicker reappears when I shut down / restart my
computer. That's a potential security issue because you might not be the
only person using your computer and all of a sudden this errant frame of
video pops up.

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https://bugs.launchpad.net/bugs/1845102

Title:
  Video flicker on triggering OSD in Xorg (but not Wayland)

Status in gnome-mpv package in Ubuntu:
  Incomplete
Status in mpv package in Ubuntu:
  Incomplete
Status in vlc package in Ubuntu:
  Incomplete
Status in xorg-server package in Ubuntu:
  Incomplete

Bug description:
  Description:  Ubuntu Eoan Ermine (development branch)
  Release:      19.10
  My specs:
  Advanced Micro Devices, Inc. [AMD/ATI] Caicos PRO [Radeon HD 7450]
  Intel(R) Core(TM)2 Quad CPU Q9400  @ 2.66GHz

  A flicker occurs with video playback in mpv, gnome-mpv, or VLC on X
  when the OSD is triggered (a volume change), for example:
  https://imgur.com/a/M6P325u.

  This also occurs on 19.04 but with the Adwaita theme enabled instead
  of Yaru.

  This issue does not occur in Wayland.
  This issue does not occur if I use the older Yaru theme (in 19.10).

  (The Z-shaped tear previously associated with this bug report is fixed
  by adding TearFree to the radeon Xorg config.)

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