# Enable the X11 windowing system.
  services.xserver = {
    enable = true;
    # Write the xorg.conf file to /etc/X11/xorg.conf
    exportConfiguration = true;

    layout = "us";
    videoDrivers = [ "nvidia" ];
    deviceSection =
      ''
        BusID "PCI:04:00:0"
      '';


    # Try to simply use 1080 + mst DP
    xrandrHeads = [ "DP-2.1" "DP-2.8" ];

    displayManager.slim.enable = true;
    #displayManager.kdm.enable = true;
    #desktopManager.kde4.enable = true;

    desktopManager = {
      gnome3.enable = true;
      default = "gnome3";
    };

  };