Hi again Hugues I'll give it a try.
I'm using the Thunderbolt port on the Early 2011 MacBook Pro 17". I can't connect an external screen, as I only have one Thunderbolt port.
The main display aka screen 1 is the MacBook screen.
I will see if there any other monitor options, but the Device Manager is reporting the same names aka Generic non_pnp monitor
Thanks again
Mike