linux-kernel - Re: 2.6.26: thinkpad x60 is cooled passively

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Message-ID: <20080908132912.GB18486@elf.ucw.cz>
Date:	Mon, 8 Sep 2008 15:29:12 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Theodore Tso <tytso@....edu>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.26: thinkpad x60 is cooled passively

On Wed 2008-08-13 16:43:38, Theodore Tso wrote:
> On Wed, Aug 13, 2008 at 05:31:37PM -0300, Henrique de Moraes Holschuh wrote:
> > > know the fans have a tendency to go bad within 12-18 months, and so
> > > the CPU heat sink and fan unit needs to be replaced perdiocially.
> > > What does /proc/acpi/ibm/fan report? 
> > 
> > ThinkPad fans have a overdesign range of about 2x, they almost never stop
> > because they're too old.  Clogged in dirt, on the other hand... a clogged
> > fan often spins FASTER and cools less.
> > 
> > Want to see how much your fan has as far as a safety margin goes? use
> > thinkpad-acpi to measure RPMs in level 7 and also when you switch PWM off
> > (i.e. set it to 100% duty cycle).  Mine gets faster by 1500RPM or so that
> > reflects the extra torque the EC can apply to get the fan to run at the
> > speed it wants it to.
> 
> Hmm, maybe I've just had bad luck, or I live in a very dusty
> environment (four cats, including two longhairs in perma-shed mode,
> will do that to any house), but I've had at least 3 fan failures in
> the past 5-6 years where the fan stopped entirely, and had to be
> replaced.  When I took it out, it was quite dirty, but the way it spun
> why I tried moving the fan blades with my finger, it felt just like
> the failure modes I've had with standard power supply fans that have
> gone bad due to old age.

Okay, seems like vojtech fixed my notebook with a bit of compressed
air... a lot of dust came out, and machine works okay now.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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