I am having an issue with certain games where they have sound, but no visual. Using NVIDIA control panel, I can force it to run on my integrated card, which it then runs extremely laggy because its running on the integrated card, VS the 960m.
I only have an issue with this on certain games, some run with absolutely no problem, games like CS:GO, Skyrim, Garry's Mod, and others work fine. But then games like GTA V, Overwatch, World of Warcraft(?), City's: Skylines, Faster Than Light, and more do not work at all if I run it on my NVIDIA card. I see no pattern to any of these games, its just random games work and others don't unless I run them on my integrated Intel GPU.
Let me add I sent my computer to Dell themselves, and they didn't even fix the issue. So I am completely out of options.
The problem is there are youtube videos of my exact computer playing those games.
There are more. Just look up dell inspiron 15 7559 [game name]