I'm happy user of MSI GP60 Leopard. It has Intel HD Graphics 4600 and nVidia GeForce 840M. Official driver downloaded from nVidia website doesn't work. After install X server hangs right after login attempt. But after adding Xorg-Edgers PPA repo and install suggested driver works everything. I also installed Prime Indicator to switch gfx card but it's force me to logout and login again.
And here is a question: is it possible to switch gfx card without logout? Or is it possible to switch it automagically?