cf36b3db80
default. See
http://www.codon.org.uk/~mjg59/power/good_practices.html
for the reasoning. (Basically, the ‘performance’ and ‘powersave’
governors don't actually provide extra performance or power savings
in most cases.)
It used to be that desktop environments like KDE were able to set
the governor through HAL (e.g. KDE could be configured to switch to
the powersave governor when the user unplugs his laptop). However,
this is no longer the case with upower — it is now expected that
everybody uses the ondemand governor. See
http://old.nabble.com/-PATCH--powerdevil-remove-cpufreq.patch-td27815354.html
* Rename ‘cpuFreqGovernor’ to ‘powerManagement.cpuFreqGovernor’.
* Include cpufreq-utils in the system path if a governor is set, since
we depend on it anyway.
svn path=/nixos/trunk/; revision=30991
45 lines
894 B
Nix
45 lines
894 B
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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{
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###### interface
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options = {
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powerManagement.cpuFreqGovernor = mkOption {
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default = "";
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example = "ondemand";
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description = ''
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Configure the governor used to regulate the frequence of the
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available CPUs. By default, the kernel configures the governor
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"userspace".
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'';
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};
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};
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###### implementation
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config = mkIf (config.powerManagement.cpuFreqGovernor != "") {
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environment.systemPackages = [ pkgs.cpufrequtils ];
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jobs.cpufreq =
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{ description = "Initialize CPU frequency governor";
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startOn = "started udev";
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task = true;
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script = ''
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for i in $(seq 0 $(($(nproc) - 1))); do
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${pkgs.cpufrequtils}/bin/cpufreq-set -g ${config.powerManagement.cpuFreqGovernor} -c $i
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done
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'';
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};
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};
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}
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