High consumption on idle with a thinkpad T400

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http://www.linuxquestions.org – Hi everyone, My laptop has a very high consumption when running on idle (I mean nothing that write on the disk or video etc..). I read on lenovo forums that people could get 10-12W and I can hardly get lower than 20W. My cpufreq is set to powersave and my cpus are always at the lowest scale. Im looking for a thread, HOWTO or someone that could help me configure my laptop to save some power. It used to last almost 7h on battery (sadly I don't remember the consumption) on Ubuntu and now it can barely last more than 3h with slackware. My config is: T400 intel duo core 3,06ghz 14.1" TFT (HowTos)