nvidia@tegra-ubuntu:~$ export DISPLAY=:0
nvidia@tegra-ubuntu:~$ xrandr
Screen 0: minimum 8 x 8, current 1280 x 720, maximum 32767 x 32767
DSI-0 connected primary 1280x720+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x720      60.00*+
HDMI-0 connected 1280x720+0+0 (normal left inverted right x axis y axis) 1150mm x 650mm
   1920x1080     60.00 +  59.95    50.00    30.00    29.97    25.00    24.00    23.98  
   1920x1200     59.89  
   1680x1050     59.96  
   1600x1200     60.01  
   1440x900      59.89  
   1400x1050     59.98  
   1280x1024     60.00  
   1280x960      60.00  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00* 
   1024x768      60.01  
   800x600       60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       59.94  
DSI-1 connected (normal left inverted right x axis y axis)
   1280x720      60.00 +