Re: Xorg server crash in nvidia 295.20.
This sounds similar to my problem. The system runs Fedora17 with Gnome3. About 1 minute after login to Gnome the GUI freezes. It always fails in about this timescale seemingly regardless of what I do. From memory, I think there is initially a little mouse movement remaining then that also freezes. I don't know about any other form of system access (tty, LAN). No keyboard controls (ctl-alt-del, switch to virtual console, etc.) have any effect. Recovery requires a hard reboot.
I have only just tried the nVidia driver so cannot comment on how new this problem is. For the time being I have switched back to neaveau which works fine if a little slow. The system reports the following graphics card type:
01:00.0 VGA compatible controller: nVidia Corporation G92M [Quadro FX 3600M] (rev a2)