I have an external monitor which I want to connect to my laptop, using both monitors at the same time. However I can't manage to have them both working. Only one monitor works at a time. In the following image I have the display configuration I'm trying to use: http://imgur.com/a/rUuG2
With both on and setting the laptop as my primary screen I was hoping it would work, but I can never get both screens to work at the same time.. If anyone can help me I'd appreciate. I must say that I'm relatively new to linux, so forgive me if this is a dumb question.
Kind regards, Daniel.