Subject: Re: Question about speedstep and the est.frequency.target sysctl
To: Brian Buhrow <email@example.com>
From: Daniel Carosone <firstname.lastname@example.org>
Date: 08/26/2007 19:06:56
Content-Type: text/plain; charset=us-ascii
On Thu, Aug 23, 2007 at 11:56:24PM -0700, Brian Buhrow wrote:
> Hello. I've just acquired a Dell Latitude D400 laptop which supports
> speestep technology and which appears to have a working speedstep driver
> under NetBSD 3.x and 4.x. In attempting to write a powerd script which
> reduces the speed of the CPU when the machine is on battery power, I've
> noticed something strange.
> My script tries to slow the cpu down by setting
> machdep.est.frequency.target to the desired value, in my case, 800MHZ.
> this appears to work, and the CPU slows down, for a little while, i.e. a
> minute or so.
> Then, after a minute, the target value climes from 800 back to 1000,
> then to 1200, and back to 1400, which is as high as it can go. This
> happens without any obvious intervention from me. =20
> Can anyone explain why it is that this value doesn't stay where I set
Sounds like you have estd or something else running that's also
changing the value.
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