How to make use of Dynamic Frequency Scaling

general

Linux supports Dynamic Frequency Scaling for ThinkPads with mobile Pentium III, Pentium 4 and Pentium M processors.

configuring the kernel

2.4 kernels

Todo...

2.6 kernels

Todo..

If you have a Coppermine-piix-smi based Thinkpads like from the A2x, X2x and T2x series you might want to look at this page.

If you have a p4-class celeron based Thinkpad like the R40e you might want to look at this page

If you have a ThinkPad T23 load the following hardware specific module:

 * speedstep-ich

Since 2.6.10, there is the ondemand governor in the kernel, which replaces any userspace daemon for cpu scaling and works very well.

configuring SpeedStep daemons

• cpufreqd
• cpudynd
• speedfreqd
• powersaved