The current theory according Colin is that the CPU scaling is working
properly, and that the fundamental problem lies with the Embedded
Controller not being able to respond quick enough with fan adjustments
when the CPU temperature spikes.
So per Colin's instructions, I set manually set the fan ( see [1] for
instructions ) to "disengaged" mode, which sets the fan to a rate higher
than the automatic "maximum" setting ( level == 7 ). The maximum auto
setting corresponds to ~4.5k rpm, whereas "disengaged" allows the fan to
spin to ~6.5k rpm.
That said, with my fan set to "disengaged" I tried running a full kernel
build ( 12.04 kernel, pulled using apt-get source, and built using
vanilla 'debuild' ) and after an hour or so, my machine again hit the
critical temperature and shut down again. Note, I was purposely trying
to max out the machine, so I had my usual set of programs running (
15-20 chromium-browser tabs, thunderbird, eclipse, and xchat-gnome ).
In short, this test has shown that the machine can't cope with an
extreme load even when the fan is cranked up all the way.
I may try contacting Lenovo support next...
Also per agreement with Colin, I'm changing the Status of this bug to
"Confirmed".
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/953205
Title:
System shuts down due to CPU temp exceeding critical thresh-hold
(100C)
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