Also reported:  http://bugs.opencompositing.org/show_bug.cgi?id=305

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From Ubuntu LaunchPad Bug: 
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/130110
Reported By:  ChrisC (https://bugs.launchpad.net/~chris-chris-camacho)

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Binary package hint: compiz

SDL_WM_ToggleFullScreen( surface );

execute this to kill xwindows!

As this is in a lot of games this directly effects bug #1 !
(I feel this is an important issue that needs resolving before release
as this will put off games players trying out Linux for the first time)

http://nehe.gamedev.net/data/lessons/linuxsdl/lesson11.tar.gz
see this code for a good example (NB mouse must be over window to see activity)

also notice pause of about half a second every second when compiz is used

Workround: disable compiz, apps work fine

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since todays update fullscreen toggle doesnt cause crash

However with compiz enabled still a pause for a second every few seconds
this doesnt happen with compiz disabled