Same for me : no way to get the external screen on. Dual screen never
had work for me (since edgy).

When settings display on, it doesn't change anything.
$ gnome-display-properties 
Resource Timestamp: 869674
Resource Configuration Timestamp: 869674
CRTC 49 Timestamp: 869674
CRTC 4a Timestamp: 869674
Output 4b Timestamp: 869674
Output 4c Timestamp: 869674
Output 4d Timestamp: 869674
New configuration
  output VGA off: 0 0 0 0
  output LVDS on: 0 0 1280 800
  output TV off: -1 -1 -1 -1
sorting
  output: -1 -1 -1 -1
  output: 0 0 0 0
  output: 0 0 1280 800
Sending client message
Resource Timestamp: 869674
Resource Configuration Timestamp: 869674
CRTC 49 Timestamp: 869674
CRTC 4a Timestamp: 869674
Output 4b Timestamp: 869674
Output 4c Timestamp: 869674
Output 4d Timestamp: 869674
New configuration
  output VGA on: 0 0 1280 1024
  output LVDS on: 0 0 1280 800
  output TV off: -1 -1 -1 -1
sorting
  output: -1 -1 -1 -1
  output: 0 0 1280 1024
  output: 0 0 1280 800
Close


$ xrandr 
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1280
VGA connected 1280x1024+0+0 (normal left inverted right x axis y axis) 359mm x 
287mm
   1280x1024      60.0*+   75.0     59.9  
   1024x768       75.1     60.0  
   832x624        74.6  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 261mm x 
163mm
   1280x800       60.0*+   60.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
TV disconnected (normal left inverted right x axis y axis)


Interesting information :
$ xrandr --output VGA --auto --left-of LVDS
xrandr: screen cannot be larger than 1280x1280 (desired size 2560x1024)


When I plug the external display and restart gdm, gdm is display in internal 
screen but at the size of the external screen !

-- 
External monitor loss - intel 945
https://bugs.launchpad.net/bugs/193419
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