I have the Acer Aspire E15 E5-574G-54Y2 and I have a NVIDIA GeForce 940M and a Intel HD Graphics w/ Windows 10 and a i5-6200U if that means anything in this case.
They switch automatically, but when I am not in a game, my screen will freeze then unfreeze and a Windows 10 Alert will say "Intel HD Graphic Windows 8(R) has stopped working and has sucessfully recovered". But it keeps happening, is there a way, without getting inside the laptop, that I can just only use my 940M, I have it on a battery all day so battery usage isn't an issue.