Power management/Processor

This article describes the setup of power management for prozessors.

CPU frequency scaling
CPU frequency scaling is a technique whereby the frequency of a processor can be automatically adjusted "on the fly" to conserve power and to reduce the amount of heat generated by the chip.

BIOS
Some functions can be enabled or disabled in the BIOS. Check that them are enabled, e.g.:
 * Processor C1E support
 * Enhanced Speedstep (EIST)

Kernel
You need to activate the following kernel options:

You need a governor, who changes the frequency based on his profile:

Ticks
The processor saves the most energy, when he stays for longer in power savings modes, so you have to reduce the amount of ticks, that wakes him up.

BIOS
Some functions can be enabled or disabled in the BIOS. Check that them are enabled, e.g.:
 * HPET
 * Multimedia timer

Kernel
You need to activate the following kernel options:

PowerTOP
PowerTOP is a utility designed to measure, explain and minimise a computer's electrical power consumption.

Software
Install :

Usage
powertop - Sorts the running processes in order how often they cause the processor to wake up.