nichts/modules/system/hardware/power.nix

{
  config,
  inputs,
  lib,
  pkgs,
  ...
}: let
  inherit (lib.modules) mkDefault;
in {
  imports = [
    inputs.watt.nixosModules.default
  ];
  config = {
    environment.systemPackages = builtins.attrValues {
      inherit
        (pkgs)
        acpi
        powertop
        ;
    };

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

    hardware.acpilight.enable = false;

    services.watt = {
      enable = true;
      # sample config from https://github.com/NotAShelf/watt#sample-configuration
      settings = {
        rule = [
          {
            cpu = {
              energy-performance-preference = "power";
              frequency-mhz-maximum = 2000;
              governor = "powersave";
              turbo = false;
            };
            "if" = {
              is-more-than = 85;
              value = "$cpu-temperature";
            };
            priority = 100;
          }
          {
            cpu = {
              energy-performance-preference = "power";
              frequency-mhz-maximum = 800;
              governor = "powersave";
              turbo = false;
            };
            "if" = {
              all = [
                "?discharging"
                {
                  is-less-than = 0.3;
                  value = "%power-supply-charge";
                }
              ];
            };
            power = {platform-profile = "low-power";};
            priority = 90;
          }
          {
            cpu = {
              energy-performance-preference = "performance";
              governor = "performance";
              turbo = true;
            };
            "if" = {
              all = [
                {
                  is-more-than = 0.8;
                  value = "%cpu-usage";
                }
                {
                  is-less-than = 30;
                  value = "$cpu-idle-seconds";
                }
                {
                  is-less-than = 75;
                  value = "$cpu-temperature";
                }
              ];
            };
            priority = 80;
          }
          {
            cpu = {
              energy-performance-bias = "balance_performance";
              energy-performance-preference = "performance";
              governor = "performance";
              turbo = true;
            };
            "if" = {
              all = [
                {not = "?discharging";}
                {
                  is-more-than = 0.1;
                  value = "%cpu-usage";
                }
                {
                  is-less-than = 80;
                  value = "$cpu-temperature";
                }
              ];
            };
            priority = 70;
          }
          {
            cpu = {
              energy-performance-preference = "balance_performance";
              governor = "schedutil";
            };
            "if" = {
              all = [
                {
                  is-more-than = 0.4;
                  value = "%cpu-usage";
                }
                {
                  is-less-than = 0.8;
                  value = "%cpu-usage";
                }
              ];
            };
            priority = 60;
          }
          {
            cpu = {
              energy-performance-preference = "power";
              governor = "powersave";
              turbo = false;
            };
            "if" = {
              all = [
                {
                  is-less-than = 0.2;
                  value = "%cpu-usage";
                }
                {
                  is-more-than = 60;
                  value = "$cpu-idle-seconds";
                }
              ];
            };
            priority = 50;
          }
          {
            cpu = {
              energy-performance-preference = "power";
              frequency-mhz-maximum = 1600;
              governor = "powersave";
              turbo = false;
            };
            "if" = {
              is-more-than = 300;
              value = "$cpu-idle-seconds";
            };
            priority = 40;
          }
          {
            cpu = {
              energy-performance-preference = "power";
              frequency-mhz-maximum = 2000;
              governor = "powersave";
              turbo = false;
            };
            "if" = {
              all = [
                "?discharging"
                {
                  is-less-than = 0.5;
                  value = "%power-supply-charge";
                }
              ];
            };
            power = {platform-profile = "low-power";};
            priority = 30;
          }
          {
            cpu = {
              energy-performance-bias = "balance_power";
              energy-performance-preference = "power";
              frequency-mhz-maximum = 1800;
              frequency-mhz-minimum = 200;
              governor = "powersave";
              turbo = false;
            };
            "if" = "?discharging";
            priority = 20;
          }
          {
            cpu = {
              energy-performance-preference = "balance_performance";
              governor = "schedutil";
            };
            priority = 0;
          }
        ];
      };
    };
    services = {
      upower = {
        enable = true;
        percentageLow = 15;
        percentageCritical = 5;
      };

      acpid = {
        enable = true;
        logEvents = true;
      };

      auto-cpufreq = {
        enable = false;
        settings = {
          charger = {
            governor = "performance";
            energy_performance_preference = "performance";
            scaling_min_freq = mkDefault 1800000;
            scaling_max_freq = mkDefault 3800000;
            turbo = "auto";
          };

          battery = {
            governor = "powersave";
            energy_performance_preference = "power";
            scaling_min_freq = mkDefault 1200000;
            scaling_max_freq = mkDefault 1800000;
            turbo = "never";
          };
        };
      };
    };
  };
}