Some useful readings on the topic: How to reduce power consumption - ThinkWiki http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption HowTo/CpuFrequencyScaling - Debian Wiki http://wiki.debian.org/HowTo/CpuFrequencyScaling Good power management practices http://www.codon.org.uk/~mjg59/power/good_practices.html -- Regards, Jörg-Volker.