xrandr -q 
Screen 0: minimum 8 x 8, current 1024 x 768, maximum 32767 x 32767
LVDS1 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 245mm x 184mm
   1024x768       60.0*+   60.0  
   800x600        60.3     56.2  
   640x480        60.0     59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)