A while ago I had a Lenovo X121e as a lightweight “surf anywhere” system. Because I also create content and I like my freedom, a tablet is not really an option for me. Because of (amongst other things) its advertised battery of up to 10 hours life I chose the X121e.
Of course the pre-delivered OS got replaced by Debian immediately. But what a shock, the battery only lasted about 3 hours! I was really disappointed, but then came across TLP, an advanced Power Management tool for Linux. Using TLP the battery lifetime more than doubled on the X121e. Still no 10 hours, but I can live with that. The amount of extra battery life is still dependent on your system, I think twice as much battery life is really not what TLP can do on every system
For the official installation instructions, please refer to the official site. I just summarize the necessary Debian steps.
Note: this is no longer needed in Debian Stretch or later as TLP is included in the official packages.
- Add the following to your sources.list (DIST can be
deb http://repo.linrunner.de/debian DIST main
- Add the necessary key:
# apt-key adv --keyserver pool.sks-keyservers.net --recv-keys CD4E8809
- Update your package lists:
# apt-get update
- Last but no least, install the necessary packages:
# apt-get install tlp tlp-rdw
Done already! Enjoy your extra battery life.