So basically i am not having any real problem with Hardy, but the power consumption seems to have less improvement than expected.
When I was using Gusty, the powertop always complained there is no CONFIG_NO_HZ option for the kernel (2.6.22). While I have upgraded to Hardy, I also found many options (e.g. laptop mode, etc) are not showing up...
Here are the power usage for different OS on my thinkpad
Hardy: 19~21W (powertop)
Gusty: 17~19W (powertop)
Windows Vista: 14~16W (thinkpad powermanager + undervolting)
Overall battery life is around 3~3.5 hours
Just wonder where does the options in the powertop goes? are they all implicitly enabled in Hardy now?
I was expecting the new ubuntu has great improvement on battery life since using the new kernel (according to lesswatts.org). But this is not the case (yet).