High consumption on idle with a thinkpad T400
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 display with 1440x900 (WXGA+) resolution with LED backlight
Switchable Graphics with Intel GMA 4500MHD and ATI Mobility Radeon HD 3470 (256 MB)
320GB 7200rpm 2.5" SATA HDD
Intel Wifi Link 5300 (AGN)
9 cells battery