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

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Message-ID: <20060809120844.GD3747@elf.ucw.cz>
Date:	Wed, 9 Aug 2006 14:08:44 +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!

> > > 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.
> >
> 
> Note: I just did a swsusp and resume and here's the same data:
> 
> $ 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:             60 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
> 
> 
> And just leaving my system idle for a few minutes:
> 
> $ grep . /proc/acpi/thermal_zone/THRM/temperature
> temperature:             62 C
> 
> and a few more minutes:
> 
> temperature:             64 C
> 
> 
> And a few more:
> 
> temperature:             66 C
> 
> 
> right now after typing this:
> 
> temperature:             69 C
> 
> 
> So this definitely shows somethings not letting the CPU rest.

Okay, run top to see what goes on, and look for
/proc/acpi/processor/*/* -- you are interested in C states before and
after suspend.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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