# X11 & GUI
 services.xserver.enable = true;
 services.xserver.enableCtrlAltBackspace = true;
 services.xserver.desktopManager = {
 xfce.enable = true;
 default = "xfce";
 };


 nixpkgs.config.allowUnfree = true;
 services.xserver.videoDrivers = [ "nvidia" ];

 services.xserver.deviceSection = ''
# Option     "Monitor-DFP0" "DVI2"
# Option     "Monitor-DFP5" "Monitor[0]"
# '';

# services.xserver.monitorSection = ''
# Identifier "DVI1"
# Option  "PreferredMode" "2560x1440"
# Identifier "DVI2"
# Option "PreferredMode" "1920x1080"
# Option     "LeftOf" "DVI1"
# '';

# services.xserver.screenSection = ''
# Monitor    "DVI1"
# Monitor    "DVI2"
# DefaultDepth     24
# SubSection "Display"
# Depth     24
# Virtual   4480 1440
# EndSubSection
# '';


# services.xserver.monitorSection = ''
# Identifier     "Monitor0"
# ModelName      "Idek Iiyama XB2776QS-B1"
# HorizSync       30.0 - 90.0
# VertRefresh     55.0 - 76.0
# Option         "DPMS"
# '';

# services.xserver.monitorSection = ''
# Option  "PreferredMode" "2560x1440"
# '';

# services.xserver.screenSection = ''
#    Option "metamodes" "nvidia-auto-select +0+0 { ForceCompositionPipeline = On }"
#  '';

# services.xserver.screenSection = ''
#  Monitor    "Monitor[0]"
#  DefaultDepth    24
#  Option         "Stereo" "0"
#  Option "nvidiaXineramaInfoOrder" "DFP-5"
#  Option "metamodes" "DP-2: nvidia-auto-select +1920+0, DVI-D-0: nvidia-auto-select +0+0"
#  SubSection     "Display"
#    Depth       24
#  EndSubSection
#  '';

# services.autorandr.enable = true;


# services.xserver.virtualScreen = { x = 4480; y = 1440; };
# services.xserver.xrandrHeads = [ "DP-2"
#  { output = "DP-2"; primary = true; }
#  { monitorConfig = '' Option "left" '';
#  output = "DVI-D-0";
#  }
# ];