I have installed Elementary OS Loki 0.4.1 on my Thinkpad T440p. I have an Intel graphic controller and a Nvidia one. When I open Nvidia X server Settings app, and change the GPU to Nvidia and log out to apply the change, it will go back to Intel when I log back in?!
Nvidia X Sever settings does not change on Elementary OS Loki and Thinkpa T440p
nvidia;elementary os