xrandr

techmik@techmik-acer:~$ xrandr -q
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 160mm x 90mm
   1680x1050      60.0*+
   1280x1024      75.0     60.0
   1280x960       60.0
   1152x864       75.0
   1280x720       60.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   720x480        59.9
   640x480        72.8     75.0     66.7     60.0
   720x400        70.1