Meanwhile, I managed a simple workaround (Thank you @5oak for pointing us to a 
source) that I posted here: 
http://askubuntu.com/questions/119843/how-to-force-multiple-monitors-correct-resolutions-for-lightdm
It works great for me without issues.
All you have to do is change your laptop screen and monitor screen resolutions 
in the script as well as the screens' labels.
Use the command: xrand -q  to identify them accurately.

http://ubuntuone.com/1AJIiERgE4Yl7d0ICmWh9e

In my case, I am using a Dell XPS 15 L502X connected to a Wide screen
(1920x1080) through mini DisplayPort.

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https://bugs.launchpad.net/bugs/874241

Title:
  Wrong resolutions in lightdm login screen when using external monitor
  connected to laptop

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