xrandr

rincewind@netbook:~$ xrandr
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 1600 x 1600
LVDS connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
   1366x768       60.0*+
   1360x768       60.0
   1280x768       60.0
   1280x720       60.0
   1024x768       60.0
   1024x600       60.0
   800x600        60.0
   800x480        60.0
   640x480        60.0
DFP1 disconnected (normal left inverted right x axis y axis)
CRT1 connected 1400x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
   1400x1050      60.0*
   1280x1024      75.0     60.0
   1440x900       59.9
   1280x960       60.0
   1280x800       60.0
   1152x864       60.0     75.0
   1280x768       60.0
   1280x720       60.0
   1024x768       75.0     70.1     60.0
   1024x600       75.0     70.1     60.0
   800x600        72.2     75.0     60.3     56.2
   800x480        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     67.0     59.9