I'm not 100% sure. I got the information from what I red on different web sites and forums.
The things is my laptop is pretty new and almost no one (at least visible through reasonable searches) has discussed this particular issue for this particular laptop.
If you have a better way to detect which VGA adapter is used first I'm for it
But if the Intel adapter is used first, what could we do to anyway use the NV one as adapter for xorg?