tlp is set of powersaving-scripts for Lenovo/IBM ThinkPads (c), which handle powersaving options according to the current power source. It was originally written by linrunner for Ubuntu. A port is available at the AUR. Although it is written for ThinkPads, it should work on other laptops as well, but without ThinkPad specific functions. Some features are:
- Kernel-Laptop-Mode and timouts for writeback of the filesystembuffer to hard disk
- Advanced Power Management Level per hard disk
- I/O scheduler per hard disk
- SATA Aggressive Link Power Management (ALPM)
- Wifi powersaving mode for wifi-cards with iwlagn driver
- battery-charging thresholds on some ThinkPads with (optionally) tp_smapi
- and some more...
Just install it from the AUR. After successful installation, you can start tlp by typing as root/with sudo:
To start tlp as a deamon, add tlp to the DEAMONS section in Template:Filename
DEAMONS=( ... tlp ...)
The config-file is located at Template:Filename. To make use of the battery-charging option, install and configure Tp_smapi. A full list of Options is documented here: www.thinkpad-wiki.org (currently only in German language)
Some intel wifi cards require to set their powersaving options after establishing connection. Therefore the original version of tlp adds a script to Template:Filename, which itself calls (as root)
tlp wifi $IFACE
where $IFACE is the current Interface (e.g. wlan0). In Arch Linux, there is no such possibility by default. If you own a wifi card, which is not supported out of the box, please use the post-up methods of your preferred networking manager (like netcfg oder NetworkManager).
If tlp sets the powersaving options properly on ac-state changed, you do not need to change anything. Check this, by issuing the following command twice, before and after unplugging your ac adapter:
iwconfig | grep "Power Management"