xrandr

$ xrandr -q
Screen 0: minimum 320 x 200, current 3520 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+980+1080 (normal left inverted right x axis y axis) 797mm x 333mm
   1920x1080     60.00*   50.00    59.94
   1680x1050     59.88
   1600x900      60.00
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
   3440x1440_50.00  50.00
   uw3440x1440_50.00  49.96
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected 1600x900+1920+180 (normal left inverted right x axis y axis) 432mm x 239mm
   1600x900      60.00*+
   1440x900      60.00
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   640x480       75.00    72.81    66.67    59.94
   720x400       70.08
HDMI-A-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+  50.00    59.94    59.99
   1600x1200     60.00
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1366x768      59.79
   1280x800      60.00
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
  uw 3440x1440_50.00 (0x7dd) 344.000MHz -HSync +VSync
        h: width  3440 start 3672 end 4040 total 4640 skew    0 clock  74.14KHz
        v: height 1440 start 1443 end 1453 total 1484           clock  49.96Hz