We have two differnt models of laptops, both use the same model docking station. The docking stations contain both VGA and DVI-D inputs. In case one with laptop type one, we dock the laptop, both screens are connected, one via VGA and the other via DVI-D, and both work to extend desktop or duplicate desktop accross two screens. Swap the laptop to type two and only the screen connected via VGA works.
Laptop type one has for what I can see an Nvidia display adapter / Graphics card, laptop type two has an Intel HD 3000 display adapter / graphics card.
Idont know how we can make this work, this is only to suit when in the office, when working remotley away from the office, the laptop is a laptop.