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

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Message-ID: <20100821170551.GA27159@elf.ucw.cz>
Date:	Sat, 21 Aug 2010 19:05:51 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jiri Slaby <jirislaby@...il.com>
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)

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.

Well; if it survives warm reboot, then it looks like BIOS problem...

> >>> 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.

Ok, so this looks like the kernel problem, on the other hand. Two
different problems?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
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