From owner-freebsd-questions@FreeBSD.ORG  Tue Jan 27 23:59:54 2009
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From: Chuck Swiger <cswiger@mac.com>
To: Shawn Badger <shawnbadger@gmail.com>
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Date: Tue, 27 Jan 2009 15:59:53 -0800
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Cc: freebsd-questions@freebsd.org
Subject: Re: Laptop battery life on FreeBSD
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On Jan 27, 2009, at 3:19 PM, Shawn Badger wrote:
> I'm somewhat of a minimalist and don't use X11.  I've disabled the  
> bluetooth adapter, but frequently use my wireless adapter (intel pro/ 
> 2200bg).  Does anyone have any suggestions that could potentially  
> extend my battery life?

Have you tried reducing HZ to 100 (put kern.hz="100" in /boot/ 
loader.conf and reboot)?
Are you running powerd?  Look into "sysctl hw.acpi" and "sysctl  
debug.cpufreq"....

Regards,
-- 
-Chuck