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

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Date:	Fri, 20 Aug 2010 08:39:54 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	linux-acpi@...r.kernel.org,
	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 08/20/2010 08:31 AM, Pavel Machek wrote:
> On Tue 2010-08-10 20:39:44, Jiri Slaby wrote:
>> 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.
> 
> Seems like bios problem... Update bios?

I don't think so, it had been working for more than 2 years before this
issue appeared.

>>> 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.
> 
> Well, doing 20 suspends in a row from a script should not be too bad.

20 is just a guess. I haven't seen it for pretty few days until the day
before yesterday. And it looks like CPU1 is brought up a half way. When
the fan was at full speed I tried:
echo 0 > /sys/devices/system/cpu/cpu1/online
and whole system freezed. Otherwise this commands succeeds.

I'll load a crash kernel prior turning the CPU off next time.

thanks,
-- 
js
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