linux-kernel - Re: Fan runs full speed after S3 sometimes (regression)

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Date:	Tue, 10 Aug 2010 20:39:44 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	linux-acpi@...r.kernel.org
CC:	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Fan runs full speed after S3 sometimes (regression)

On 08/10/2010 01:20 PM, Jiri Slaby wrote:
> Hi,
> 
> till I was running on 2.6.34-rc5-mm1 (mmotm) and earlier everything was
> fine. Now, I'm running 2.6.35-rc6-mm1 (.35-rc5-mm1 was the same) and
> sometimes when the computer (desktop) returns from S3, the CPU fan is
> running at full speed making a big noise.

Just to add, full power cycle is needed to get rid of that. Warm reboot
is not enough.

> I don't know how to debug that. Bisection is out of question -- it
> happens once in 10 or 20 cases. There are no fan entries in /sys.
> 
> The load is as follows:
> $ while :; do cat /proc/loadavg; sleep 3; done
> 0.37 0.33 0.32 1/325 21358
> 0.42 0.34 0.32 1/325 21362
> 0.42 0.34 0.32 1/326 21366
> 0.38 0.33 0.32 1/330 21386
> 0.38 0.33 0.32 1/331 21391
> 0.35 0.33 0.32 1/331 21394
> 0.32 0.32 0.32 1/331 21397
> 0.32 0.32 0.32 1/331 21400
> 0.30 0.32 0.32 1/331 21403
> ...
> 
> I can boot into 34-rc5 to compare that if this is of relevance.
> 
> 290 kB kernel log since boot over several S3 sleep till now where the
> fan is noisy:
> http://www.fi.muni.cz/~xslaby/sklad/panics/boot.msg-fan_fullspeed
> 
> Should you need DSDT, it's there too:
> http://www.fi.muni.cz/~xslaby/sklad/panics/DSDT
> 
> Any ideas what could have caused this?
> 
> thanks,
-- 
js
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