You keep answering so I post what I found again: Increase Battery Lifetime (using laptop_mode) The laptop mode of the kernels since 2.6.6 is describe here. Recentlym the activation of the laptop_mode has become significantly easier, with the introduction of the laptop mode tools. Download and install the laptop mode tools (I currently use version 1.04) as described on the web page. I routinely get 4.5 hours out of my batteries (with the screen backlighting turned down to the minimum). http://www.hep.phy.cam.ac.uk/~andersen/fedora2latitude600.html
