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[Arie Pshedezki <pshedezki2@xxxxxxxxx>]

I saw in some computers in my lab with graphic card geforce gtx 660 of nvidia
and ubuntu 14.04 a weird bug and i'm not sure if that's what that this thread is about.
After some minutes of working all or many of the letters in the screen begin to blink or being replaced.
I attach a photo of the problem.?

The problem was solved, probably by changing the driver to

Nvidia binary driver- version 331.38 from nvidia-331 (proprietary,
tested)

It seems that changing definitions in compiz did not help

** Attachment added: "picture of the bug"
   https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1307144/+attachment/4282850/+files/Screenshot%20from%202014-11-13%2008_19_59.png

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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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