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[Bug 1307144] [NEW] 'unredirect fullscreen windows' causes tearing


Public bug reported:

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

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

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: compiz tearing vblank vsync

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  'unredirect fullscreen windows' causes tearing

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