Tlp is a command line utility we can use to optimize power consumption on Linux. It provides reasonable defaults, and, at the same time, an easy to understand text-based configuration file we can use to create our own setup. An external project provides a user-friendly GTK frontend to Tlp written in Python: Tlpui.
When using Linux on mobile devices such as Laptops, it is very important to tune the right kernel parameters in order to optimize battery life. Tlp is a highly customizable, free and open source command line utility released under the GPLv2 license (the source code is hosted on github) created with this exact goal.