Hi christopher, I've bought this computer over 3 years ago  and used nothing 
but Ubuntu on it. As far as I can remember the problems started with the 
Quantal release (12.10). Just random lockups, sometimes happening more 
frequent. I've tried clocking down my GPU (Coolbits) to the lowest possible 
clock, but it still happens.
First I thought it was somehow temperature related, both the GPU and CPU reach 
80 degrees Celsius sometimes, but after some testing it even happens when there 
around 50 degrees as well. I guess it does seem to be related with heavy CPU 
usage, this seems to trigger the situation more often explaining the fact I 
suspected the temperature at first.
I'm still wondering if it isn't hardware malfunction, is this a probable cause 
for these kind of errors?

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https://bugs.launchpad.net/bugs/1258231

Title:
   NVRM: os_schedule: Attempted to yield the CPU while in atomic or
  interrupt context

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