xrandr

$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 1600 x 1600
LVDS connected 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
   1600x900       60.1*+
   1440x900       60.1 +
   1280x800       60.1 +
   1152x864       60.1 +
   1280x768       60.1 +
   1280x720       60.1 +
   1024x768       60.1 +
   1024x600       60.1 +
   800x600        60.1 +
   800x480        60.1 +
   720x480        60.1 +
   640x480        60.1 +
DFP1 disconnected (normal left inverted right x axis y axis)
CRT1 disconnected (normal left inverted right x axis y axis)