I have a Lenovo ThinkPad L412 with a non-overclocked i5 2nd gen, 4GB RAM, and a Radeon HDv545. Whenever I use Windows and have possibly battery intensive applications running, the battery still lasts a minimum of 2.5 hours.
However, I’ve noticed that when I switch to Linux (I’m currently using openSUSE with power management enabled) I notice a rapid drain in battery life. Linux automatically enables Bluetooth and I must make sure it’s always off when I boot my system. Does Linux enable any other features I must turn off to conserve battery?
Why does Linux drain my battery and how do I overcome this?
Torcellite, besides turning off Bluetooth, make sure you have
CPUFreq or similar installed:
Package: cpufreqd Priority: optional Section: universe/admin Description-en: fully configurable daemon for dynamic frequency and voltage scaling cpufreqd is meant to be a replacement of the speedstep applet you can find on some other OS, it monitors the system status and selects the most appropriate CPU level. It is fully configurable and easily extensible through the many available plug-ins (more to come). Despite its name it can be used to control also the NForce2-Atxp1 voltage regulator and the core and memory clock for NVidia cards (see README.Debian). . You need a CPUFreq driver and either APM, ACPI (a recent version) or PMU enabled in your kernel in order for this daemon to work. Homepage: http://sourceforge.net/projects/cpufreqd
Basically it would drop your
CPU speed when your system is idle. This will be a huge power saver, and it will cool your CPU significantly as well.
The default setting in Debian/Ubuntu is on demand, which is the best setting for personal use.