$ xrandr
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 1680 x 1680
VGA1 disconnected
DVI0 connected 1680x1050+0+0 434mm x 270mm
   1680x1050      59.9*+
   1280x1024      75.0     59.9
   1152x864       74.8
   1024x768       75.1     60.0
   800x600        75.0     60.3
   640x480        75.0     60.0
   720x400        70.1
VGA2 disconnected
DVI1 connected 1680x1050+0+0 434mm x 270mm
   1680x1050      59.9*+
   1280x1024      75.0     59.9
   1152x864       74.8
   1024x768       75.1     60.0
   800x600        75.0     60.3
   640x480        75.0     60.0
   720x400        70.1