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[Deluxo <1307144@xxxxxxxxxxxxxxxxxx>]

I do have the same issue (mostly). Fullscreen unredirected windows
flicker when I change volume or screen birghtness (notify-osd overlay).
After notification disappears, tearing goes away. Sometimes artifacts
stick to window shadows or the cursors for while (few minutes), then go
away. Havent installed no fancy drivers. Vannilla ubuntu 14.10, intel i5
sandy.

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https://bugs.launchpad.net/bugs/1307144

Title:
  'unredirect fullscreen windows' causes tearing

Status in “compiz” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu release: 14.04
  Installed compiz version: 1:0.9.11+14.04.20140409-0ubuntu1

  The option 'unredirect fullscreen windows', which is enabled by
  default in Compiz, causes tearing in games and other fullscreen OpenGL
  applications, even with 'sync to vblank' options enabled in ccsm, in
  the GPU settings and in the game.

  With this option disabled, VSync works as fine as should with
  'unredirected fullscreen windows' enabled and there is no tearing (but
  this causes performance issues and the Unity panel shadow on top of
  the application).

  Tested with:
  - ASUS NVIDIA GTX 650-E-1GD5 with NVIDIA proprietary driver 331.38 (tested) (nvidia-331)
  - the same graphics card with NVIDIA proprietary driver 331.38 (nvidia-331-updates)
  - the same graphics card with Nouveau open source driver (xserver-xorg-video-nouveau)
  - Intel HD 4000 iGPU with default open source drivers

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