xrandr

Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     29.98*
   2048x1080     59.99
   1920x1080     60.00    60.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.95
   1280x1024     75.02    60.02
   1440x900      74.98    59.89
   1280x960      60.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
HDMI-A-0 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 621mm x 341mm
   3840x2160     30.00*+
   2560x1440     59.95
   1920x1080     60.00    50.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      74.98    59.90
   1280x960      60.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x576i      50.00
   720x480       60.00    59.94
   720x480i      60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
DVI-D-0 disconnected (normal left inverted right x axis y axis)