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From: Jung-uk Kim <jkim@niksun.com>
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Date: Mon, 16 Aug 2004 14:21:57 -0400
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cc: Maxim Sobolev <sobomax@portaone.com>
cc: Colin Percival <colin.percival@wadham.ox.ac.uk>
cc: freebsd-mobile@freebsd.org
Subject: Re: Enhanced SpeedStep driver available
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On Monday 16 August 2004 02:08 pm, Maxim Sobolev wrote:
> Colin Percival wrote:
> >   Thanks to everyone who has been sending me data about their
> > processors (and in particular, the 90nm versions), I now have
> > a first draft of a Enhanced SpeedStep driver available.  For
> > people with the appropriate processors (Pentium M only), this
> > makes it possible to adjust the cpu frequency via a new sysctl
> > (hw.est_curfreq), and have the cpu voltage adjusted at the
> > same time.
> >   I've also put together a very simple control daemon which
> > reads kern.cp_time every second and adjusts the cpu frequency
> > based on the fraction of cpu time which is idle.  This increases
> > my laptop's battery life by around 40%.
>
> It would be nice if you can extend it to use whatever speed control
> method is available (e.g. ACPI, TCC, ESS etc), so that it can be
> used on older machines as well.

I found ACPI driver here:
http://www.spa.is.uec.ac.jp/~nfukuda/software/

FYI...

Jung-uk Kim

> -Maxim
>
> >   All the code is online at
> > http://www.daemonology.net/freebsd-est/
> >   Assuming I don't hear any major bug reports in the next few
> > days, I'll package these into ports and hopefully get them into
> > the ports tree in time for 5.3-RELEASE.
> >
> > Colin Percival