CPU frequency scaling

["Peter Tynan" <happy@sdf.lonestar.org>]

I came across an article over at
http://polishlinux.org/linux/debian/green-pcs-cpu-frequency-scaling-in-linux/
about CPU frequency scaling and thought I's give it a try but whenever
I run the command

"modprobe powernow_k7" or "modprobe acpi_cpufreq"

I get the response along the lines of

"FATAL: Error inserting powernow_k7
(/lib/modules/2.6.24-1-686/kernel/arch/x86/kernel/cpu/cpufreq/powernow-k7.ko):
No such device"

I using Debian Lenny with the latest 686 kernel.

Anybody any ideas?

Peter