{lib, config, pkgs, ...}: let
  inherit (lib) mkDefault;
in{
  hardware.acpilight.enable = true;

  environment.systemPackages = with pkgs; [
    acpi
    powertop
  ];

  services = {
    # handle ACPI events
    acpid.enable = true;

    # allows changing system behavior based upon user-selected power profiles
    power-profiles-daemon.enable = true;

    # temperature target on battery
    undervolt = {
      tempBat = 65; # deg C
      package = pkgs.undervolt;
    };

    # superior power management
    auto-cpufreq = {
      enable = true;

      # define the profiles
      # (you can manually switch between profiles using `powerprofilesctl` cmd)
      settings = let
        MHz = x: x * 1000;
      in {
        battery = {
          governor = "powersave";
          scaling_min_freq = mkDefault (MHz 1200);
          scaling_max_freq = mkDefault (MHz 1800);
          turbo = "never";
        };

        charger = {
          governor = "performance";
          scaling_min_freq = mkDefault (MHz 1800);
          scaling_max_freq = mkDefault (MHz 3800);
          turbo = "auto";
        };
      };
    };

    # DBus service that provides power management support to applications
    upower = {
      enable = true;
      percentageLow = 15;
      percentageCritical = 5;
      percentageAction = 3;
      criticalPowerAction = "Hibernate";
    };
  };

  boot = {
    kernelModules = ["acpi_call"];
    extraModulePackages = with config.boot.kernelPackages; [
      acpi_call
      cpupower
    ];
  };
}