xrandr
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 608mm x 345mm
   3840x2160     30.00*+  29.97    25.00    23.98
   2560x1440     59.95
   1920x1080     60.00    59.94    50.00    29.97    23.97
   1680x1050     59.95
   1600x900      60.00
   1440x900      59.89
   1280x1024     75.02    60.02
   1280x800      59.81
   1280x720      60.00    59.94    50.00
   1152x864      75.00
   1024x768      75.03    70.07    60.00
   800x600       75.00    72.19    60.32    56.25
   720x576       50.00
   720x480       59.94
   640x480       75.00    72.81    59.94
DVI-D-0 disconnected (normal left inverted right x axis y axis)