finally fixed it!
i found a way to force the game to use my nvidia card and it was quite simple to be honest.
here is how i did it:
sidenote: i'm from germany so naturally the language in the nvidia menu is also german. i'll translate the options but they can be named a little different in the english version of the menu.
first you need to open the "nvidia control panel" and select the "3d-settings manager". in the first tab "global settings" you can choose the preferred graphic chip. mine was set to "automatic" and since amnesia is an open gl game my laptop switched from my nvidia card to the intel chip. you just have to manually select your nvidia chip so the game will be forced to use the right card.
i hope this helps some of you that suffer from the same problem.
and now i'm finally off to play