Dear all,
Thank you for your information.
From: [EMAIL PROTECTED]
Subject: Re: Pentium 3 Clock Frequency Control
Date: Sun, 28 Jan 2007 00:14:54 +0500
Message-ID: <[EMAIL PROTECTED]>
applecom> FK <[EMAIL PROTECTED]> wrote:
applecom>
applecom> > Is it posible to control Pentium 3 clock frequency on FreeBSD?
applecom> > The purpose is to reduce the power consumption and lengthen battery
applecom> > life.
applecom> > In addition, how can we know what speed of cpu clock frequecy a cpu
applecom> > supports and what speed a cpu take at any given time? I suppose
applecom> > that a command which returns each information exist.
applecom> > Well, a couple years ago I patched to, if I remember correctly,
applecom> > 5.4 kernel and it made this need possible at least on Pentium M.
applecom> > I tried to find the web page but I failed.
applecom> > I am using FreeBSD6.0-RELEASE now.
applecom>
applecom> Look at
applecom> http://lists.freebsd.org/pipermail/freebsd-acpi/2005-March/001346.html
applecom> Hope it helps.
I thought cpufreq.ko is a driver for cpu frequecy control,
as its man page says. I loaded it to the kernel, with nothing changed
like below.
The output of my sysctl is differen from the website you showed me. The
sysctl of his mentioned acpi, which I disabled. I chose apm, because
it turned off the TFT backlight, which acpi failed. TFT backlight off
is also critical for the power-saving.
Any suggetions?
Still, I would like to know what cpu the cpufreq.ko supports. Its man
page does not say anything. And I would like to know whether we have
any other drivers on which this function is implemented.
--
FK.
-- Quoted from Man --
DESCRIPTION
The cpufreq driver provides a unified kernel and user interface to CPU
frequency control drivers. It combines multiple drivers offering differ-
ent settings into a single interface of all possible levels. Users can
access this interface directly via sysctl(8) or by indicating to
/etc/rc.d/power_profile that it should switch settings when the AC line
state changes via rc.conf(5).
-- End of quatation --
>sysctl dev.cpu
dev.cpu.0.%driver: cpu
dev.cpu.0.%parent: legacy0
>sysctl dev | grep apm
dev.apm.0.%desc: APM BIOS
dev.apm.0.%driver: apm
dev.apm.0.%parent: legacy0
>kldstat
Id Refs AddressSize Name
1 12 0xc040 3d5e94 kernel
21 0xc07d6000 51f8 snd_t4dwave.ko
32 0xc07dc000 1d9c8sound.ko
41 0xc07fa000 57ac apm.ko
52 0xc15d7000 c000 ipfw.ko
61 0xc15e5000 4000 ipdivert.ko
71 0xc163b000 4000 logo_saver.ko
81 0xc1643000 15000linux.ko
91 0xc2011000 8000 cpufreq.ko
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