Username or EmailPassword
remember that to extend battery life you can use the cpu throttling supplied in the vanilla kernel.
my Dell Inspiron 5150 (3.06GHz P4, GeforceFX 5200go) gets about two hours at full speed (surfing the web, irc, etc) and 50mins at full load (gentoo ^_^).
after echoing "powersave" to the sysfs scaling governor, i get four hours (at 1.5GHz surfing the web, irc, etc).
i dont bother compiling at 1.5GHz, i put it into powersave to extend the battery time.
coupling this with a simple lcd-off script to turn off the screen when the lid is down, and i get a good six hours from this beast.
echoing "performance" puts it back to normal.
this does not need ACPI or any kernel patches.