Seems to be a known problem with Xgl:
http://wiki.archlinux.org/index.php/Xgl_Troubleshooting#Xgl_and_.28OpenGL.29_Games_in_Fullscreen_Mode
Still it would be great to see fixed.
** Also affects: xserver-xgl (Ubuntu)
Importance: Undecided
Status: New
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3D Games not fullscreen after upgrade to Gutsy
https://bugs.launchpad.net/bugs/154290
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