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
98 lines
2.1 KiB
Nix
98 lines
2.1 KiB
Nix
{ config, pkgs, ... }:
|
|
|
|
with pkgs.lib;
|
|
|
|
let
|
|
|
|
cfg = config.powerManagement;
|
|
|
|
sleepHook = pkgs.writeScript "sleep-hook.sh"
|
|
''
|
|
#! ${pkgs.stdenv.shell}
|
|
action="$1"
|
|
case "$action" in
|
|
hibernate|suspend)
|
|
${cfg.powerDownCommands}
|
|
;;
|
|
thaw|resume)
|
|
${cfg.resumeCommands}
|
|
${cfg.powerUpCommands}
|
|
;;
|
|
esac
|
|
'';
|
|
|
|
in
|
|
|
|
{
|
|
|
|
###### interface
|
|
|
|
options = {
|
|
|
|
powerManagement = {
|
|
|
|
enable = mkOption {
|
|
default = false;
|
|
description =
|
|
''
|
|
Whether to enable power management. This includes support
|
|
for suspend-to-RAM and powersave features on laptops.
|
|
'';
|
|
};
|
|
|
|
resumeCommands = mkOption {
|
|
default = "";
|
|
description = "Commands executed after the system resumes from suspend-to-RAM.";
|
|
};
|
|
|
|
powerUpCommands = mkOption {
|
|
default = "";
|
|
example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
|
|
description =
|
|
''
|
|
Commands executed when the machine powers up. That is,
|
|
they're executed both when the system first boots and when
|
|
it resumes from suspend or hibernation.
|
|
'';
|
|
};
|
|
|
|
powerDownCommands = mkOption {
|
|
default = "";
|
|
example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
|
|
description =
|
|
''
|
|
Commands executed when the machine powers down. That is,
|
|
they're executed both when the system shuts down and when
|
|
it goes to suspend or hibernation.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
};
|
|
|
|
|
|
###### implementation
|
|
|
|
config = mkIf cfg.enable {
|
|
|
|
# Enable the ACPI daemon. Not sure whether this is essential.
|
|
services.acpid.enable = true;
|
|
|
|
environment.systemPackages = [ pkgs.pmutils ];
|
|
|
|
environment.etc = singleton
|
|
{ source = sleepHook;
|
|
target = "pm/sleep.d/00sleep-hook";
|
|
};
|
|
|
|
boot.kernelModules =
|
|
[ "acpi_cpufreq" "cpufreq_performance" "cpufreq_powersave" "cpufreq_ondemand"
|
|
"p4_clockmod"
|
|
];
|
|
|
|
powerManagement.cpuFreqGovernor = "ondemand";
|
|
|
|
};
|
|
|
|
}
|