Comment 9 for bug 665796

Kalidarn, please help us delimit the problem. From your linked thread, I see you have nVidia, it is a match with the problem related here. What is your CPU? Is it by any chance a Core i7? Do you see the timer interrupt freezing in /proc/interrupts during these events? (Use 'watch -d grep timer /proc/interrupts' to see if the timer interrupt is working)

Currently I'm using kernel 2.6.37-rc1 from https://wiki.ubuntu.com/KernelMainlineBuilds and I'm yet to see the problem happen again.