xserver = {
      enable = true;
      layout = "us";

      # KDE Desktop Environment.
      desktopManager.kde4.enable = true;

      # Touchpad
      synaptics = {
        enable = true;
        tapButtons = false;
        twoFingerScroll = true;
        minSpeed = "0.75";
        maxSpeed = "5.5";
        accelFactor = "0.015";
        palmDetect = true;
        palmMinWidth = 3;
        scrollDelta = 65;
        };
       
    };