modprobe speedstep-lib or speedstep-xyz or p4clockmod, etc..

apt-get install cpufrequtils

edit /etc/default/cpufrequtils
	change enabled to true
	change governor to ondemand (or conservative, or userspace)

restart service and cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

you may have to add the speedstep-xyz to your /etc/modules to get it to load
at startup..  also you may have to add cpufreq-ondemand, etc..