Thank you for taking your time to report this bug to make Ubuntu better.
I can confirm this issue on my system as well. Hence marking confirmed.

** Also affects: unity
   Importance: Undecided
       Status: New

** Tags added: multimonitor

** Changed in: unity
       Status: New => Confirmed

** Changed in: gnome-settings-daemon (Ubuntu)
       Status: New => Confirmed

** Summary changed:

- Display on external monitor reverts to double display at restart
+ Display on external monitor reverts to mirror display on restart and logout

** Description changed:

  I'm sorry I don't know what package this is related to.
  Edit: Thank you Fabio Marconi for identifying the package.
  
  My problem is that the system doesn't remember my display configuration when 
I reboot my netbook.
  I have an external monitor plugged to my laptop, and I use this monitor as my 
principal and only display (laptop screen not used). But when I restart my 
computer, even though the screen stays plugged in, the display goes back to 
"same image on both monitors". I have to use the shortcut "Fn + F4" to go back 
to my preferred configuration every time I boot up my computer.
  
  Steps to reproduce:
- 1. Plug in external monitor with VGA
- 2. Choose the external monitor as your main and only monitor
- 3. Reboot
+ 1. Plug in external monitor with VGA, HDMI port
+ 2. Choose the external monitor as your main and only monitor or as an 
extended display.
+ 3. Reboot or log off.
  4. The display configuration is back to "same image on both monitors"
  
  Expected behaviour:
  The system should remember the user's favourite display configuration for a 
better work-flow. A lot of people use their laptop as a desktop with a bigger 
monitor plugged into it.

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https://bugs.launchpad.net/bugs/979699

Title:
  Display on external monitor reverts to mirror display on restart and
  logout

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