{ config, lib, pkgs, ... }:
{
  services = {
    tlp = {
      enable = true;
      extraConfig = ''
        # Needed for either SSD or btrfs.
        SATA_LINKPWR_ON_BAT=max_performance
      '';
    };
    xserver.xkbModel = "thinkpad60";
  };

  boot = {
    kernelModules = [ "tp_smapi" "thinkpad_acpi" "fbcon" "i915" "acpi_call" ];
    extraModulePackages = with config.boot.kernelPackages; [ tp_smapi acpi_call ];
  };

  systemd.services = {
    battery_threshold = {
      description = "Set battery charging thresholds.";
      path = [ pkgs.tpacpi-bat ];
      after = [ "basic.target" ];
      wantedBy = [ "multi-user.target" ];
      script = ''
        tpacpi-bat -s ST 1 39
        tpacpi-bat -s ST 2 39
        tpacpi-bat -s SP 1 80
        tpacpi-bat -s SP 2 80
      '';
    };
  };
}