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1b1ed1a
(Get the code!)
Hello Aaron,
Thanks for taking the time to comment on the issue.
In my case it does seem like a hardware problem, because the driver crashes in Windows 7 as well. (It doesn't hang, however Windows keeps saying that 'nvidia driver crashed and was restored'.) I can't tell whether the symptoms are the same though, because I don't use Windows that much and don't know where to find nvidia logs there.
Besides, sometimes after the crash I have to turn off my laptop for several minutes, otherwise it repeats right after reboot. (Both in Ubuntu and Windows.)
However, after I changed PowerMizer mode to 'Prefer Maximum Performance' in nvidia-settings in Ubuntu, the issue disappeared completely. (I changed it back to 'Adaptive' since then, because the fan was a little bit too noisy.) Besides, now it happens less frequently (because of new kernel version?) So it seems that even if it's a hardware issue, it's triggered by nvidia driver.
I can't check nouveau, because it doesn't support my GPU (GeForce GT 555M). And the temperature was the first thing I looked into, it's not a problem.