I have reported the same symptoms earlier with an Intel Core i5 PC
running Quantal, bug 1029865. I have installed the kernel from comment
#7 also there and booted it, but that machine still shows the ghost VGA
display and due to that comes up with a 1024x768 login screen. I have
checked with "uname -a" that the fixed kernel is actually running.

Is the fixed kernel not applicable to Quantal? Are more components of
Raring needed (like X.org)? If so, I would try an upgrade to Raring.

The xrandr output is as follows:

----------
till@till:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA1 connected (normal left inverted right x axis y axis)
   1024x768       60.0  
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9  
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm 
x 287mm
   1920x1080      60.0*+
   1680x1050      59.9  
   1280x1024      60.0  
   1280x960       60.0  
   1280x720       60.0  
   1024x768       60.0  
   800x600        60.3  
   720x576        50.0  
   720x480        59.9  
   640x480        60.0     59.9  
   720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
till@till:~$ 
----------

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https://bugs.launchpad.net/bugs/1156310

Title:
  xrandr detects too many displays

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