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{ pkgs, lib, ... }:
{
  # current issues:
  #  1. for pressing insert hold shift+fn+Fin

  # scroll by holding middle mouse
  services.xserver.displayManager.sessionCommands =''
      xinput set-int-prop "ETPS/2 Elantech TrackPoint" "Evdev Wheel Emulation" 8 1
      xinput set-int-prop "ETPS/2 Elantech TrackPoint" "Evdev Wheel Emulation Button" 8 2
      xinput set-prop "ETPS/2 Elantech TrackPoint" "Evdev Wheel Emulation Axes" 6 7 4 5
      # configure timeout of pressing and holding middle button
      # xinput set-int-prop "ETPS/2 Elantech TrackPoint" "Evdev Wheel Emulation Timeout" 8 200
      xinput disable 'ETPS/2 Elantech Touchpad'
  '';
  boot.kernelParams = [
    #"psmouse.proto=imps"
    #"psmouse.proto=bare"
    #"psmouse.resetafter=0"
    "psmouse.synaptics_intertouch=1" # echo 1 > /sys/devices/platform/i8042/serio1/reg_07
  ];

  programs.light.enable = true;
  services.actkbd = {
    enable = true;
    bindings = [
      { keys = [ 225 ]; events = [ "key" ]; command = "${pkgs.light}/bin/light -A 10"; } # fn - F5
      { keys = [ 224 ]; events = [ "key" ]; command = "${pkgs.light}/bin/light -U 10"; } # fn - F6
      # fn - 4 => suspend
      # fn - d => lcdshadow
      { keys = [ 227 ]; events = [ "key" ]; command = builtins.toString ( # fn - F7
        pkgs.writers.writeDash "toggle_touchpad" ''
          PATH=${lib.makeBinPath [ pkgs.xorg.xinput pkgs.gnugrep ]}
          DISPLAY=:0
          export DISPLAY PATH

          device=$(xinput list --name-only | grep Touchpad)
          if [ "$(xinput list-props "$device" | grep -P ".*Device Enabled.*\K.(?=$)" -o)" -eq 1 ];then
              xinput disable "$device"
          else
              xinput enable "$device"
          fi
        '');
      }
    ];
  };
}