How to configure two Screen Resolutions

I want to config two screen resolutions ,one is 19201280 another one is 12801024
I config the file name is xorg.conf
Section “Module”
Disable “dri”
SubSection “extmod”
Option “omit xfree86-dga”
EndSubSection
EndSection

Section “Device”
Identifier “Tegra0”
Driver “nvidia”

Allow X server to be started even if no display devices are connected.

Option      "AllowEmptyInitialConfiguration" "true"

EndSection

Section “ServerFlags”
Option “BlankTime” “0”
Option “StandbyTime” “0”
Option “SuspendTime” “0”
Option “OffTime” “0”
EndSection

Section “Monitor”
Identifier “Monitor0”
VendorName “Monitor Vendor”
ModelName “Monitor Model”
Modeline “1920x1080_60.00” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
EndSection

Section “Screen”
Identifier “Screen0”
# Device “Card0”
Device “Tegra0”
Monitor “Monitor0”
DefaultDepth 24
SubSection “Display”
Viewport 0 0
Depth 24
Modes “1280x1024”
EndSubSection
EndSection
But the two screens have the same resolution.
How can I config the two screen have different resolution.Thank you very much

Please refer to this thread.
https://devtalk.nvidia.com/default/topic/1043732/change-the-default-output-resolution-from-720p-to-1024-1280/