If you just installed speedfreq, skip cpufreq now. When it is run, it sorts the running processes in order of how often they cause the processor to wake up. If your script is ready, add it to the battery runlevel. LCD Power Management 5. Cups writes to disk periodically, so consider shutting it down and only enable it manually when needed. You probably don’t want to shut it down completely, but it’s possible to modify the config file so that “unnecessary” things don’t get logged and thus don’t create disk traffic.

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Gentoo Forums :: View topic – Great, so cpufrequtils is gone?

When cpufreqd has been configured, it is time to start it and make sure the service is loaded automatically. I do “emerge-webrsync” and “emerge –sync” during every install, which is probably why it isn’t masked for the rest of you. Having done your changes, start the daemon. If your script is ready, add it to the battery runlevel. Please be careful when applying this on a non-laptop system.

Enable the Power Management Unit plug-in of cpufreqd. This page contains changes which are not marked for translation.

Do you do anything special with your cpu frequency? PowerTOP is a utility designed to measure, explain and minimize a computer’s electrical power consumption.


Time to change it. To make the switch between AC and battery convenient, create a runlevel battery that holds all the scripts starting and stopping Power Management.

Make sure to stop laptop-mode before your battery runs out of power and data gets written to disk – otherwise you will at least lose the last 10 minutes of your work. Depending on the system, either acpi or apm will need to be set. Retrieved from ” https: Sun Feb 25, 9: Retrieved 12 June Besides putting your disk to sleep state as early as possible, it is a good idea to minimize disk accesses.

Power Management Guide

Onces it’s ready, make sure it gets called. On the one hand less energy is consumed, on the other hand there is thermal improvement as your system cpjfreq get as hot as running on full speed.

The cruel workaround until it’s implemented is as following: As this guide has become rather long, here’s a short overview helping you to find your way through it. In this case, the userspaceondemandand conservative governors are unnecessary. The last thing to check is that your new policies do a good job.

A sample cpufreqd config file. Retrieved 12 June If you still are confused and don’t know which one to choose, first give swsusp2 a try, it looks most promising.


Maybe your bios doesn’t fully recognize the model, because it’s coufreq for providing the frequency state tables for acpi-cpufreq. Power Management for other devices. In such cases, the feature from ccpufreq laptop mode tools must be disabled so that both tools do not fight over the same resource control.

Power management/Processor – Gentoo Wiki

Care about the package in a local overlay you can also make it public if you want to serve the Gentoo community ; if upstream still exists, you can just start with the latest ebuild which was in portage if you missed it, you can always fetch it from CVS [or git in some future].

There are currently three implementations for S4. Be sure to read the documentation in laptop-mode. However, we will also refer to other tools that might offer a more detailed approach on individual settings. Something that works and has no known security issues. Also, cpupower which is maintained at kernel.