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Processor «Frequency Scaling» support on Debian

«Frequency Scaling» is the system designed to allow your processor to work at different speeds to reduce heating and power consumption. It is mainly used in laptop, where batteries are used.

To activate it for your processor on Debian (with GNOME), you need a recent kernel (any 2.6 will probably do).

You first need to load the appropriate kernel modules for your processor's capabilities. As a reminder, you can check the exact type of processor in your PC on Linux by display of /proc/cpuinfo. Then, try to load the guessed appropriate module from /lib/modules/`uname -r`/kernel/arch/i386/kernel/cpu/cpufreq/*.ko with modprobe (without the .ko extension, of course).

Once you get one which does not fail with an error message, it is probably the right one.

Make it permanent (i.e. resistent to a reboot) by adding two lines in your /etc/modules: one with cpufreq-userspace and the second with the module you just selected (again without the .ko extension, of course).

Then install package powernowd (probably the simplest one to use).

And finally, in your Desktop Environment, install an applet to see and control it, gnome-cpufreq-applet as an example which has been integrated in package gnome-applets starting from Debian Etch.

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