power management not working

[zyd]

i recently bought a dell inspiron 1501 and installed opensuse 10.2 on it. It works great, the only problem was the wireless card but it was solved with ndiswrapper.
Well that's not entirely true i have this one problem, the power management doesn't seem to be working, i have a 53 WHr battery and it goes from 100 % to 25 % in less than 1.5 hours in suse, and about 3 hours in windows. I checked and i have the ondemand cpu governor to downgrade the cpu frequency when is required and the power profile is in powersaved mode as indicated in yast2 power-management.
By the way usage conditions are the same in both linux and windows, no optical unit being used, no sound being played, just the screen and the keyboard.
What could be wrong?

[aliov]

I don't think that under windows you have ondemand it's probably always power save,so the same for SuSE disable the ondemand and use always power save when running on battery, another thing Check the minimum frequency for your cpu go to /proc/acpi/processor/CPU0/ and cat performance.

one other thing,i had this before but when the power manager gives you 1 hour remaining some times it gonna be 2 hours instead,so power manager get confused when you run ondemand.

there is no reason for this difference,since both Windows and Linux use ACPI.

Cheers.