109 lines
2.7 KiB
Nix
109 lines
2.7 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.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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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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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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default = "";
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example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
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description =
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''
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Commands executed when the machine powers up. That is,
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they're executed both when the system first boots and when
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it resumes from suspend or hibernation.
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'';
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};
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powerDownCommands = mkOption {
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default = "";
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example = "${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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# Enable the ACPI daemon. Not sure whether this is essential.
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services.acpid.enable = true;
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boot.kernelModules =
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[ "acpi_cpufreq" "powernow-k8" "cpufreq_performance" "cpufreq_powersave" "cpufreq_ondemand"
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"cpufreq_conservative"
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];
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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 = "This target is reached after a hibernate/suspend/hybrid-sleep has woken up.";
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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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