{ pkgs, lib, ... }:
let

in
{
  services.tlp = {
    enable = true;
    settings = {
      CPU_ENERGY_PERF_POLICY_ON_AC = "balance_performance";
      CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
      CPU_ENERGY_PERF_POLICY_ON_SAV = "power";
      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
      PCIE_ASPM_ON_BAT = "powersave";
      CPU_SCALING_GOVERNOR_ON_AC = "balanced";
      PCIE_ASPM_ON_AC = "balanced";
      CPU_BOOST_ON_AC = 1;
      CPU_BOOST_ON_BAT = 0;
      CPU_BOOST_ON_SAV = 0;
      DEVICES_TO_DISABLE_ON_BAT_NOT_IN_USE = "bluetooth wifi wwan";

      TLP_DEFAULT_BATTERY_MODE = "SAV";
      CPU_HWP_DYN_BOOST_ON_AC = 1;
      CPU_HWP_DYN_BOOST_ON_BAT = 0;
      CPU_HWP_DYN_BOOST_ON_SAV = 0;
      PLATFORM_PROFILE_ON_AC = "balanced";
      PLATFORM_PROFILE_ON_BAT = "low-power";
      PLATFORM_PROFILE_ON_SAV = "quiet";
      START_CHARGE_THRESH_BAT0 = 40; # 40 and below it starts to charge
      STOP_CHARGE_THRESH_BAT0 = 80; # 80 and above it stops charging
    };
  };
  # services.tuned.enable = true;
  services.thermald.enable = true;
  services.upower = {
    enable = true;
  };
  boot.kernelParams = [
    # "mem_sleep_default=deep"
    "i915.fastboot=1"
    "pcie_aspm=force"
    "ahci.mobile_lpm_policy=1"
  ];
  services.logind.settings.Login = {
    HandleLidSwitch = "suspend";
    HandleLidSwitchExternalPower = "suspend";
    HandleLidSwitchDocked = "ignore";
  };
  systemd.sleep.extraConfig = ''
        HibernateDelaySec=30min
    		SuspendEstimationSec=120
  '';

  systemd.services.rfkill-sleep-wake = {
    enable = true;
    description = "Using rfkill; disable all rf devices before sleeping.";
    before = [ "sleep.target" ];

    serviceConfig = {

      Type = "oneshot";
      ExecStop = ''${pkgs.utillinux}/bin/rfkill unblock all'';
      ExecStart = ''${pkgs.utillinux}/bin/rfkill block all'';
      RemainAfterExit = true;
    };
    wantedBy = [ "sleep.target" ];
    partOf = [ "sleep.target" ];

  };
  # one of "ignore", "poweroff", "reboot", "halt", "kexec", "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate", "lock"
  powerManagement = {
    enable = true;
    # powertop.enable = true;
  };
}