Please describe the problem:
When playing a game fullscreen game such as frozen-bubbles with compiz enabled, the game will exit fullscreen and fallback into a window. 

If gnome-screensaver is configured to start after one minute of inactivity, the problem will happens exactly one minute after you started the game, no matter if you are using the mouse/keyboard during that minute.

Disabling gnome-screensaver is a workaround.
Disabling compiz is a workaround.

Steps to reproduce:
1. Have compiz enabled (compiz --replace)
2. Set gnome-screensaver to start after one minute of inactivity
3. Start a fullscreen game like frozen-bubbles (which can go fullscreen if you type "f" while the game is running).
4. Play a game during more than a minute.


Actual results:
the game exit fullscreen and get back into a window.

Expected results:
The game should stay fullscreen and gnome-screensaver should never start, because the computer is still used.

Does this happen every time?
Yes

Other information:
More details on ubuntu LP bug https://bugs.launchpad.net/ubuntu/+bug/32457