dd209e901c
Additionally, put the powersave utility in charge of loading the cpufrequency modules based on the governor specified in the configuration.
105 lines
2.5 KiB
Nix
105 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.powerManagement;
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in
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{
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###### interface
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options = {
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powerManagement = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description =
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''
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Whether to enable power management. This includes support
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for suspend-to-RAM and powersave features on laptops.
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'';
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};
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resumeCommands = mkOption {
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type = types.lines;
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default = "";
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description = "Commands executed after the system resumes from suspend-to-RAM.";
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};
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powerUpCommands = mkOption {
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type = types.lines;
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default = "";
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example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
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description =
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''
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Commands executed when the machine powers up. That is,
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they're executed both when the system first boots and when
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it resumes from suspend or hibernation.
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'';
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};
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powerDownCommands = mkOption {
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type = types.lines;
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default = "";
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example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
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description =
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''
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Commands executed when the machine powers down. That is,
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they're executed both when the system shuts down and when
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it goes to suspend or hibernation.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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# FIXME: Implement powersave governor for sandy bridge or later Intel CPUs
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powerManagement.cpuFreqGovernor = mkDefault "ondemand";
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powerManagement.scsiLinkPolicy = mkDefault "min_power";
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systemd.targets.post-resume = {
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description = "Post-Resume Actions";
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requires = [ "post-resume.service" ];
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after = [ "post-resume.service" ];
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wantedBy = [ "sleep.target" ];
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unitConfig.StopWhenUnneeded = true;
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};
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# Service executed before suspending/hibernating.
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systemd.services."pre-sleep" =
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{ description = "Pre-Sleep Actions";
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wantedBy = [ "sleep.target" ];
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before = [ "sleep.target" ];
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script =
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''
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${cfg.powerDownCommands}
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'';
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serviceConfig.Type = "oneshot";
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};
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systemd.services."post-resume" =
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{ description = "Post-Resume Actions";
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after = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" ];
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script =
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''
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${cfg.resumeCommands}
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${cfg.powerUpCommands}
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'';
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serviceConfig.Type = "oneshot";
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};
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};
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}
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