G5 + 2.6.12 Powers off Underload

Benjamin Herrenschmidt benh at kernel.crashing.org
Sun Jul 31 01:53:03 EST 2005

On Thu, 2005-07-28 at 12:01 -0400, Omkhar Arasaratnam wrote:
> We have some users who are complaining that a G5 running 2.6.12 will
> power off or freeze underload. They define load as "when the fan comes
> on". They claim it happens on multiple machines, Fedora and Gentoo.
> Thoughts?

Did it happen with earlier kernels ?

If you create a binary /sbin/critical-overtemp, do you see it beeing run
about 30sec before it powers down ?

You can add some code to the therm driver to see what's going on, it's
possible that the heat is ramping up too fast for the fan algorithm to
catch up. Above max + 8 °C, my code triggers a shutdown.


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