From owner-freebsd-stable@FreeBSD.ORG  Mon Feb 20 00:29:38 2006
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Date: Mon, 20 Feb 2006 01:29:10 +0100
From: Bartosz Fabianowski <freebsd@chillt.de>
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To: Ryan R <air.lightz@gmail.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Need serious help with Dell D600 Latitude laptop and
 Power	Management please :)
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> I am running a Dell D600 Latitude laptop [...] Here in FreeBSD, my
> fans are running FULL SPEED all of the time and also seems to be
> hotter than many conventional ovens.


I'm on a Dell Inspiron 8600C (which is the cheaper consumer-grade 
version of your laptop) and it runs nice and cool for me. You are 
probably missing the power management daemon (powerd). For more 
information, see man powerd and to see whether it helps, add the 
following to your /etc/rc.conf:

powerd_enable="YES"

HTH,
- Bartosz