xrandr output

Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm
   1600x900      59.95*+
   1280x1024     75.02    60.02
   1280x960      60.00
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00
   1024x768      75.08    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   640x480       75.00    72.81    66.67    60.00
   720x400       70.08