To add to the above, installed thinkfan with a reasonable config file,in
particular specifying:
(127, 74, 32767)
which sets the fan to unregulated above 74C.
got to hear my fan under 12.04 for the first time I can remember.
Loaded the system, did slip above 90C a few times, but not above 95C.
Fan went to 7300rpm, temp mostly 70-80C.
Without thinkfan, the system would have shut down.
So there is a problem under 12.04 that thinkfan ameliorates.
That is not to say there is not an underlying hardware problem also.
Next thing i will try is to get the fan replaced.
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https://bugs.launchpad.net/bugs/1009731
Title:
Since 12.04, CPU is overheating and powering off spontaneously under
high computation load
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