diff options
Diffstat (limited to 'nixos/modules/config/power-management.nix')
-rw-r--r-- | nixos/modules/config/power-management.nix | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/nixos/modules/config/power-management.nix b/nixos/modules/config/power-management.nix new file mode 100644 index 000000000000..7299136235ed --- /dev/null +++ b/nixos/modules/config/power-management.nix @@ -0,0 +1,112 @@ +{ config, pkgs, ... }: + +with pkgs.lib; + +let + + cfg = config.powerManagement; + +in + +{ + + ###### interface + + options = { + + powerManagement = { + + enable = mkOption { + type = types.bool; + default = true; + description = + '' + Whether to enable power management. This includes support + for suspend-to-RAM and powersave features on laptops. + ''; + }; + + resumeCommands = mkOption { + type = types.lines; + default = ""; + description = "Commands executed after the system resumes from suspend-to-RAM."; + }; + + powerUpCommands = mkOption { + type = types.lines; + default = ""; + example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda"; + description = + '' + Commands executed when the machine powers up. That is, + they're executed both when the system first boots and when + it resumes from suspend or hibernation. + ''; + }; + + powerDownCommands = mkOption { + type = types.lines; + default = ""; + example = "${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; + + boot.kernelModules = + [ "acpi_cpufreq" "powernow-k8" "cpufreq_performance" "cpufreq_powersave" "cpufreq_ondemand" + "cpufreq_conservative" + ]; + + powerManagement.cpuFreqGovernor = mkDefault "ondemand"; + powerManagement.scsiLinkPolicy = mkDefault "min_power"; + + systemd.targets.post-resume = { + description = "Post-Resume Actions"; + requires = [ "post-resume.service" ]; + after = [ "post-resume.service" ]; + wantedBy = [ "sleep.target" ]; + unitConfig.StopWhenUnneeded = true; + }; + + # Service executed before suspending/hibernating. + systemd.services."pre-sleep" = + { description = "Pre-Sleep Actions"; + wantedBy = [ "sleep.target" ]; + before = [ "sleep.target" ]; + script = + '' + ${cfg.powerDownCommands} + ''; + serviceConfig.Type = "oneshot"; + }; + + systemd.services."post-resume" = + { description = "Post-Resume Actions"; + after = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" ]; + script = + '' + ${cfg.resumeCommands} + ${cfg.powerUpCommands} + ''; + serviceConfig.Type = "oneshot"; + }; + + }; + +} |