linux-kernel - Re: swsusp and suspend2 like to overheat my laptop

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Message-ID: <20060809115843.GB3747@elf.ucw.cz>
Date:	Wed, 9 Aug 2006 13:58:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Suspend2-devel@...ts.suspend2.net, linux-pm@...l.org,
	ncunningham@...uxmail.org
Subject: Re: swsusp and suspend2 like to overheat my laptop

Hi!

> > Okay, can you try to leave it up for a week or two (no suspends, no
> > poweroffs) and see what happens?
> 
> I've had this laptop running for a couple of months without shutting down
> and it doesn't have a problem.  The only time that I do shut it down

Ok.

> > > > P4 has thermal protection, so you are actually safe.
> > >
> > > Yeah, but still, the keyboard gets pretty hot too, and I'm actually more
> > > worried about damaging something that is close by than damaging the CPU
> > > itself.
> >
> > If you damage something, machine was misdesigned in the first place.
> 
> agreed, but you never know ;)  This laptop is currently my lifeline :)

You'd have good reason to get new one.

> > cat we get contents of /proc/acpi/thermal*/*/* ?
> 
> I'm running after a poweroff (left it running over night in the hotel, and
> I'm still in the hotel).
> 
> $ grep . /proc/acpi/thermal_zone/THRM/*
> /proc/acpi/thermal_zone/THRM/cooling_mode:<setting not supported>
> /proc/acpi/thermal_zone/THRM/cooling_mode:cooling mode: passive
> /proc/acpi/thermal_zone/THRM/polling_frequency:<polling disabled>
> /proc/acpi/thermal_zone/THRM/state:state:                   ok
> /proc/acpi/thermal_zone/THRM/temperature:temperature:             48 C
> /proc/acpi/thermal_zone/THRM/trip_points:critical (S5):           88 C
> /proc/acpi/thermal_zone/THRM/trip_points:passive:                 81 C: tc1=4 tc2=3 tsp=100 devices=0xcf6c2338
> 
> Note thermal_zone/THRM was finished with bash tab completion so they are
> the only things that match the above glob expr.

Ok, so it is the bios doing temperature control up-to 81C. At 81C,
linux should start cooling it, and at 88C, linux should shutdown. At
little higher temperature, hardware should emergency shutdown.

> > How s2ram works would be useful info.
> 
> No idea.

Well, try it :-). suspend.sf.net.

> It does look like something isn't setting up the ACPI power properly on
> resume, and that the CPU is probably in a busy loop while the machine is
> idle.  Just a guess.

Fan is not controlled by ACPI. But we may be saving some memory we
should not save, or something like that.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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