Comment 3 for bug 363672

I have a similar problem on my Dell e6400 with an NVidia NVS 160m graphics card.

Depending on how hard the crash is I can still use the system or switch to a console. Here is what I have in my Xorg.0.log.old after a reboot. It looks to me the NVidia Driver crashes.

(II) NVIDIA(0): Initialized GPU GART.
(WW) NVIDIA(0): The NVIDIA X driver has encountered too many errors. Falling
(WW) NVIDIA(0): back to write-back cached memory.

Here is a screenshot of what the screen looks like when it crashes.
http://www.avecstyle.ca/screenshots/2.jpg