nixos/laptop/modules/services.nix

{
  ...
}:
{
  services.thermald.enable = true; # Prevents overheating/throttling
  services.power-profiles-daemon.enable = false;
  services.tlp = {
    enable = true;
    pd.enable = true;

    settings = {
      TLP_AUTO_SWITCH = 1;

      CPU_DRIVER_OPMODE_ON_AC = "active";
      CPU_DRIVER_OPMODE_ON_BAT = "active";
      CPU_DRIVER_OPMODE_ON_SAV = "active";
      CPU_SCALING_GOVERNOR_ON_AC = "performance";
      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
      CPU_ENERGY_PERF_POLICY_ON_BAT = "balance_power";
      CPU_ENERGY_PERF_POLICY_ON_AC = "balance_performance";
      CPU_MIN_PERF_ON_BAT = 0;
      CPU_MAX_PERF_ON_BAT = 80;

      WIFI_PWR_ON_AC = "off";
      WIFI_PWR_ON_BAT = "on";

      MEM_SLEEP_ON_BAT = "deep";
    };
  };

  services.logind = {
    # Use 'settings' for modern NixOS Unstable/Stable
    settings = {
      Login = {
        HandleLidSwitch = "suspend-then-hibernate";
        HandleLidSwitchExternalPower = "suspend";
        HandleLidSwitchDocked = "ignore"; # Keeps external monitors alive
      };
    };
  };

  systemd.sleep.extraConfig = ''
    HibernateDelaySec=10min
  '';
}