On the one hand less energy is consumed, on the other hand there is thermal improvement as your system doesn’t get as hot as running on full speed. This guide assists you setting it up on your laptop. The support for CPU frequency management in the laptop mode tools allows switching frequencies. For Intel core processors, this should be selected as default. It supports setting the CPU frequency governor, minimum frequency and maximum frequency. Tue Feb 20, 4: Check that battery support is compiled into your kernel.

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The original one is cupfreq, then there is swsusp2 which has the nicest interface including bootsplash supportbut requires manual kernel patching. It doesn’t, unlike cpufrequtils, run as a daemon. Most laptops offer the possibility to control the backlight dimming.

But it is not the only configuration yentoo to work with. Care about the package in a local overlay you can also make it public if you want to serve the Gentoo community ; if upstream fentoo 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].

Compile USB support and devices as modules and remove them via a script while they are not in use e.


Power Management Guide

USB selective suspend only allows bus accesses in case the device is in use. This includes BIOS settings, kernel configuration and some simplifications in user land. LCD Power Management 5. If you use it as a module, make sure the module is loaded.

There are currently three implementations for S4. I just bought a brand new battery, but it only lasts for some minutes! I’ll show you two possibilities to do it.

Power management/Processor/ru – Gentoo Wiki

Observe there are two USE flags that seem to collide: Here’s what I found: The cpufreqd application allows the user to manage CPU frequencies in a more granular approach than what laptop-mode-tools supports. The support for CPU frequency management in the laptop mode tools allows switching frequencies. Nevertheless modern processors consume much more energy than older ones and each laptop generation introduces more devices hungry for energy.

To make the switch between AC and battery convenient, create a runlevel battery that holds all the scripts starting and stopping Power Management. Mon Feb 19, 7: Using a recent kernel will make sure you’ll get the most out of it. What you can do as a user in such a situation: It supports setting the CPU frequency governor, minimum frequency and maximum frequency.

Thanks, if it gives you two no genyoo I am going to go ahead and emerge it! Last not least Troubleshooting lists common pitfalls. 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.


There are distros designed to run on as wide range hardware as possible. For newer Intel Core series of processors based on the Sandy Bridge microarchitecture or neweruse the Intel P-state driver. View unanswered posts View posts from last 24 hours. Notice that throttling doesn’t save much energy coufreq is mainly used for thermal management keeping your laptop cool and quiet.

Let’s bring the hard disk to sleep as early as possible whenever it is not needed. PowerTOP is a utility designed to measure, explain and minimize a computer’s electrical power consumption.

You can safely skip this section if you don’t like the idea of having another runlevel.

You probably don’t want to shut it down completely, but it’s ccpufreq to modify the config file so that “unnecessary” things don’t get logged and thus don’t create disk traffic. As this guide has become rather long, here’s a short overview helping you to find your way through it.