D1000 - Games don't use the good graphic card

[schubby]

Hello,

I have my screen pluged with a DisplayPort on my D1000 and my D1000 pluged on my laptop with USB cable.

When I do that, all my games are launch on my internat chipset and not my Nvidia card.

If I plug my screen directly on my laptop (still with DisplayPort) on my laptop, i have no problem.

I tried to disable my internal graphic chipset (was a bad idea )
I tried to force my laptop to use my grapic card for my games (it doesn't care :/ )
I tried to change my graphic card in my game settings but my graphic card is not in the list (I can choose it if i plus directly my screen to my laptop)

i don't have anymore idea

anybody can help me ?

Nicolas