xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1024 x 1024
VGA connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0* 
   800x600        60.3  
   640x480        59.9  
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 246mm x 185mm
   1024x768       50.0 +   60.0*    40.0  
   800x600        60.3  
   640x480        60.0     59.9