alnassafi@MacBookPro:~$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 400, current 2880 x 1800, maximum 2880 x 1800
default connected primary 2880x1800+0+0 0mm x 0mm
   1024x768       60.0
   800x600        60.0
   640x480        60.0
   1024x640       60.0
   840x525        60.0
   720x450        60.0
   640x400        60.0
   2880x1800      60.0*
   2560x1600      60.0
   2048x1536      60.0
   2048x1280      60.0
   1920x1200      60.0
   1600x1200      60.0
   1680x1050      60.0
   1400x1050      60.0
   1280x1024      60.0
   1440x900       60.0
   1280x960       60.0
   1280x800       60.0