I have found some information at the link below. Apparently only mobile processors are supported. You could try:
modprobe processor modprobe powernowd-k8 http://technowizah.com/2007/01/debian-how-to-cpu-frequency-management.html -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]

