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
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Kubuntu Jaunty 64 bits hangups often with nvidia-glx-180
https://bugs.launchpad.net/bugs/363672
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