What power settings yield the highest battery life?

Now, I'm pretty sure the smart answer to this is to turn everything all the way down - but there are so many different options that I am asking you all - which settings in the BIOS / Power Manager do you use to achieve maximum battery life other than the obvious (Screen all the way down / CPU Speed Lowest / WiFi OFF - that depends upon your usage). I have the 9 cell battery and I get about 4.5 - 5.5 hours with the screen all the way off and using RMClock for regular internet / word processing (TabletPCReview has a thread on how to use RMClock to get rid of that buzz most of you hear when on battery power - this is the same config I use) in conjunction with Power Manager.

btw my CPU is undervolted from .950 to .975...

 

1. If the RMclock fix you are using is the "Run HLT command when system is idle" then this will hit the battery life because you are stopping the CPU entering its low power states (it is the transitions to/from lower power which casue the CPU whine). You may have to reconsider your options if you want more battery time.

2. Having Bluetooth enabled (it doesn't need to be active) on some Samsung notebooks reduces by battery time because it stops the CPU dropping into the C3 low power state.

You can use the performance monitor (Start > Run > Perfmon) enables you to monitor the CPU power states. A notebook under light load should be in the C3 state 80 to 90% of the time.

John

 

It doesn't use the HLT command -
http://forum.tabletpcreview.com/showthread.php?t=3516

I have bluetooth disabled.

I'm not sure how / what you mean by using Perfmon to have it enter the C3 states - I see no option there. on RM Clock I have it set to enter all 5 states (C1E, C2E, C3E, C4E, Hard C4E)