FreeBSD 6 on Centrino laptop : how to prolong battery life with cpufreq (like est and estctrl did)

[Luk van den Borne]

2005/11/12, Miles Keaton <mileskeaton at gmail.com>:
> > Miles Keaton wrote:
> > > I'm happily using FreeBSD 6 on a Centrino laptop, but wondering if
> > > anyone can explain ("for dummies") how to use the new cpufreq +
> > > SpeedStep to throttle-down my CPU usage and extend battery life - the
> > > way that sysutils/est and sysutils/estctrl used to do in FreeBSD 5?
> On 11/12/05, J. Martin Petersen <jmp.lists at alvorlig.dk> wrote:
> > I'm using powerd, it's working great.
>
>
> Any advice on usage?  I tried it and got this error:
>
> # powerd -a minimum
> powerd: lookup freq: No such file or directory
You should load cpufreq in your loader.conf. I believe cpufreq is the
backend that FreeBSD uses for (dynamic) CPU scaling.
cpufreq_load="YES"

rc.conf:
powerd_enable="YES"
powerd_flags="-a adaptive -b adaptive -n adaptive"

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