High fan speed after return from suspend (on Ubuntu)

Posted by Bolo on Super User See other posts from Super User or by Bolo
Published on 2011-01-06T15:37:52Z Indexed on 2011/01/06 15:56 UTC
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Filed under:

ubuntu

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laptop

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ubuntu-10.04

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fan

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suspend

Hi,

I've got a HP ProBook 5310m laptop with Ubuntu 10.04 (32 bit). When I return from suspend, the fan speed is usually very high: FDTZ sensor reports "90 °C". Yes, the units are wrong, since FDTZ does not report temperature, but fan speed – that's probably just a small bug in reporting. Interestingly, when I plug or unplug the power cable for a moment, the fan speed returns back to normal.

My questions:

Where can I report this problem? Is it about ACPI support in the kernel? What is the address of the relevant bug tracker?
As a workaround for now, how can I programmatically trigger a behavior equivalent to (un)plugging the power cable. More generally, how can I force ACPI to recalculate fan speed? Ideally, I'm looking for something like echo foo > /proc/bar.

Thanks in advance!

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