This sounds kind of similar to an issue with -ati/-fglrx where leftover
bits from the proprietary driver causes random corruption and hangs.
There is a troubleshooting guide for this issue for fglrx:
https://wiki.ubuntu.com/X/Troubleshooting/FglrxInteferesWithRadeonDriver
- Mind seeing if it helps to purge away all nvidia bits and reinstall
mesa and -nv?
** Changed in: xserver-xorg-video-nv (Ubuntu)
Status: Confirmed => Incomplete
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[karmic] nv driver triggers seemingly random lockups on GeForce 7300 GT
https://bugs.launchpad.net/bugs/412469
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