Laptop battery life on FreeBSD

[Shawn Badger]

Chuck Swiger wrote:
> 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,
Thanks for the ideas Chuck.  I lowered kern.hz to 100 as you suggested 
(does this affect the kernel's ability to track time in milliseconds?  
ie. if I want to run a benchmark using the 'time' utility?).   And the 
output of the two sysctl queries is posted here:   
http://pastebin.com/m5ae8aa1c

I'm not very familiar with acpi, so if you see anything that could be 
optimized, I'd appreciate the feedback.

Shawn