{...}:
{
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
  ];

  services.upower.enable = true;

  swapDevices = [{
    device = "/var/lib/swapfile";
    size = 16*1024; # 16 GB
  }];

  services.tlp = {
    enable = true;
    settings = {
      CPU_SCALING_GOVERNOR_ON_AC = "performance";
      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";

      # intel_pstate runs in active mode, where the scaling governor barely
      # matters. EPP is the knob that actually moves power.
      CPU_ENERGY_PERF_POLICY_ON_AC = "balance_performance";
      CPU_ENERGY_PERF_POLICY_ON_BAT = "power";

      # drives the EC's PL1/PL2 power limits
      PLATFORM_PROFILE_ON_AC = "balanced";
      PLATFORM_PROFILE_ON_BAT = "low-power";

      # no turbo on battery, and cap sustained clocks. costs real
      # performance (nix builds especially) to buy runtime.
      CPU_BOOST_ON_BAT = 0;
      CPU_HWP_DYN_BOOST_ON_BAT = 0;
      CPU_MAX_PERF_ON_BAT = 60;

      PCIE_ASPM_ON_BAT = "powersave";
      RUNTIME_PM_ON_BAT = "auto";
      WIFI_PWR_ON_BAT = "on";
      SOUND_POWER_SAVE_ON_BAT = 1;
      USB_AUTOSUSPEND = 1;

      # battery longevity, not runtime. stops charging at 85%.
      START_CHARGE_THRESH_BAT0 = 75;
      STOP_CHARGE_THRESH_BAT0 = 85;
    };
  };

  hardware.bluetooth = {
    enable = true;
    powerOnBoot = true;
  };

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  hardware.graphics.enable = true;
  services.xserver.videoDrivers = [ "modesetting" ];

  # eDP-1 reports vrr_capable. Only helps fullscreen apps flipping via Present.
  services.xserver.deviceSection = ''
    Option "VariableRefresh" "true"
  '';

  environment.variables = {
    "MOZ_USE_XINPUT2" = "1";
  };

  services.xserver.displayManager.sessionCommands = ''
    xrandr --output eDP-1 --mode 2880x1920 --rate 120.00
  '';

  services.xserver.dpi = 168;

  networking.hostName = "magician"; 
 
  services.libinput = {
    enable = true;

    touchpad = {
      tapping = false;
      clickMethod = "clickfinger"; # no right click corner
      naturalScrolling = true;
    };
  };

  # This option defines the first version of NixOS you have installed on this particular machine,
  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
  #
  # Most users should NEVER change this value after the initial install, for any reason,
  # even if you've upgraded your system to a new NixOS release.
  #
  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
  # so changing it will NOT upgrade your system - see https://nixos.org/manual/nixos/stable/#sec-upgrading for how
  # to actually do that.
  #
  # This value being lower than the current NixOS release does NOT mean your system is
  # out of date, out of support, or vulnerable.
  #
  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
  # and migrated your data accordingly.
  #
  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
  system.stateVersion = "26.05"; # Did you read the comment?

}