It' s obvious i wont get any help here so i just want to signal to other ubuntu Users thinking about getting a Dell Vostro 3550, dont ! Well not if you want to use the full capability of your laptop, as there is as far as i know, no way to get and external display to work on Unbuntu 1x.xx with a Dell Vostro 3550. 

And yet another useless comment. I don t understand why dell dont put more effort into having their hardware more deeply tested for linux distribution. This is a huge and growing market and  a product as popular as the VOSTRO 3550 should be tested in every kind of way for linux compatibilties, and support other than " Thank you ! " should be provided!