Comment 17 for bug 1212163

> Does System Settings > Displays show two display rectangles?
Yes.

xrandr
Screen 0: minimum 320 x 320, current 1920 x 1080, maximum 32767 x 32767
DVI-0 disconnected (normal left inverted right x axis y axis)
DVI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 700mm x 390mm
   1920x1080 59.9*+ 60.0 59.9* 49.9 30.0 24.9 23.9
   1600x1200 59.9
   1400x1050 59.9
   1280x1024 59.9
   1360x768 59.6
   1280x768 60.2
   1280x720 59.9 59.7 49.8
   1440x576 24.7
   1024x768 74.9 70.0 59.9
   832x624 74.5
   800x600 74.9 60.3
   720x576 49.6
   720x480 59.7
   640x480 74.8 59.4
   720x400 69.8

On DVI1 It seems to work normal, no visible problems, and NO "two display rectangles".