I too can confirm this bug for me. Kubuntu (upgraded from Breezy) with the 2.6.15-25-k7 kernel, NVidia Geforce 440 MX with the free driver ("nv"). Crashes happen from time to time, sometimes the machines doesn't even boot. No mouse and keyboard then, reset by powerbutton needed.
-- KDM detected memory corruption https://launchpad.net/bugs/47455 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs