add multi monitor config.

30monitor.conf

@@ -1,4 +1,5 @@
 Section "Monitor"
     Identifier  "Monitor"
-    Mode        "1920x1080"
+    Option "PreferredMode" "1920x1080"
+    Option "ZoomModes" "1920x1080 3840x2160"
 EndSection

80nvidia.conf

@@ -0,0 +1,34 @@
+Section "ServerLayout"
+    Identifier     "Layout"
+    Screen      0  "default" 0 0
+    Option         "Xinerama" "0"
+EndSection
+
+Section "Monitor"
+    # HorizSync source: edid, VertRefresh source: edid
+    Identifier     "primary"
+    Option         "DPMS"
+EndSection
+
+Section "Device"
+    Identifier     "nvidia"
+    Driver         "nvidia"
+    VendorName     "NVIDIA Corporation"
+    BoardName      "GeForce GTX 960"
+EndSection
+
+Section "Screen"
+    Identifier     "default"
+    Device         "nvidia"
+    Monitor        "primary"
+    DefaultDepth    24
+    Option         "Stereo" "0"
+    Option         "metamodes" "DVI-I-1: 1920x1080 +1440+0, DP-0: 2560x1440 +0+0 {rotation=left}"
+    # Option         "metamodes" "DVI-I-1: 1920x1080 +2160+0, DP-0: 3840x2160 +0+0 {rotation=left}"
+    Option         "SLI" "Off"
+    Option         "MultiGPU" "Off"
+    Option         "BaseMosaic" "off"
+    SubSection     "Display"
+        Depth       24
+    EndSubSection
+EndSection