I am running Gnome Shell on Ubuntu 11.10 (32 bits). When I run some apps in fullscreen, system restarts X and I go back to the display manager screen (LightDM). It happens for example with MAME games and with many other games. It happens, more or less, at the 95% of the times. In some cases, I do not know why, It does not happen.
I have an Intel video card. I have tested this on two laptops; one of these uses an onboard Intel video card, and the other one uses the GPU included into the processor (Intel Sandy Bridge). On the same system, this does not happen on Unity, Gnome Classic or KDE.
Is there a fix to this problem?