I can confirm that coming out of an OpenGL application with an NVidia
NVS 285 card running the 173 drivers causes the refresh rate of
compiz/unity to be completely rubbish. Switching on/off Sync-to-VBlank
in compiz-OpenGL settings does nothing to resolve the issue. The only
way to resolve is to logout/login again and get a new session.

Confirmed this occurs when exiting from the following applications:

- GLMatrix Screensaver (or any other GL screensaver)
- Minecraft (which uses java GL libraries)
- AssaultCube

NOTES: I'm running nvidia-173 drivers because there is a bug in the
newer ones that prevents more than 4 windows being displayed.. see
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers/+bug/747717 for more details.

Not sure if this is a Compiz bug or a Unity bug, but I know that I don't
get the issue in Unity-2D or Ubuntu-classic sessions.

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https://bugs.launchpad.net/bugs/669109

Title:
  getting out of some OpenGL games under Unity makes the computer
  unusable

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