From owner-freebsd-questions@FreeBSD.ORG  Fri Feb 16 19:36:02 2007
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Date: Fri, 16 Feb 2007 09:11:38 -1000
From: Robert Marella <rmarella@gmail.com>
To: Jesse Sheidlower <jester@panix.com>
Message-ID: <20070216091138.2320f34a@p4>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Diagnosing fan problem
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On Thu, 15 Feb 2007 12:19:50 -0500
Jesse Sheidlower <jester@panix.com> wrote:

> 
> I have a ThinkPad T41p that has had a variety of fan problems
> for some time. After my most recent repair things seemed to be
> working fine, but the other day I was compiling some ports and
> the machine just shut down in the middle; after some
> experimentation it seemed clear that it was just overheating
> under load and shutting itself off. (Looking at the
> temperature sysctl showed that it was getting increasingly hot
> until it crashed.)
> 
> How can I monitor what is happening? Are there any ways I can
> find out from FreeBSD if the fan is even on, or how it thinks
> it is working? "systcl -a | grep fan" didn't return anything.
> Can I control the fan?
> 
> I don't want to make yet another warranty call if they're
> gonna say, "It's working fine, it's your OS" or something.
> 
> Thanks.
> 
> Jesse Sheidlower
>

Aloha Jesse

I know this is not what you are asking but my daughter had a problem
with her laptop overheating and shutting down and this fixed it.

http://www.sundialmicro.com/Note-Book-Coolers_1731.html

Of course hers was not under any warranty.

I hope this helps.

Robert