I quote a reply here: On the gaming models (of which this is one), the external port is hardwired to the nVidia GPU.  There is no way to disable the nVidia GPU for the external display. Unless there's a setting in the software to do the switch (this system doesn't have hardware-controlled hybrid video), there's no way to do what you want (short of buying a system that has hardware-controlled hybrid video;  the Precision and Alienware systems do, but the Inspiron and XPS systems do not).
Hi everyone, I have a Dell Inspiron 7560 laptop how has two graphic cards Nvidia and intel It's graphic card  Nvidia is burned and the laptop don't start I want to know if I can disable the Nvidia and switch to intel and how to do do it? Thank you.
Inspiron 7560 GeForce graphic card