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Date: Wed, 12 Mar 2003 17:40:01 -0100
From: Dave Jones <davej@codemonkey.org.uk>
To: Christopher Meredith <theophile@saintmail.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PowerNow!, cpufreq, and swsusp
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On Wed, Mar 12, 2003 at 12:06:33PM -0500, Christopher Meredith wrote:

 > Also, cpufreq doesn't seem to do anything. Should it be
 > working automatically?

no.

 > Even when the machine sits unattended
 > for over 8 hours, the fan never turns off and the cpu
 > temperature is consustently 69-70 degrees C.

The kernel doesn't define policy, but exposes the necessary
interface to userspace.  There are a few folks working on
tools / scripts to adjust the speed dynamically.
look through the cpufreq mailing list archives to find them
(or google)

 > What must I do here?

Read Documentation/cpu-freq/user-guide.txt

short: mount sysfs, and ..

(root@evo:cpufreq)# cd /sys/class/cpu/cpufreq/cpu0/cpufreq
(root@evo:cpufreq)# cat /proc/cpuinfo | grep MHz
cpu MHz		: 1390.536
(root@evo:cpufreq)# echo powersave >scaling_governor
(root@evo:cpufreq)# cat /proc/cpuinfo | grep MHz
cpu MHz		: 529.728
(root@evo:cpufreq)# echo performance >scaling_governor

		Dave

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