Xubuntu - Intel dual displays
 

Xubuntu 16.04.2 LTS
My laptop has 2 graphic cards: nvidia and built-in CPU intel.
I prefer to use intel as it is power saving option. The problem is that I cannot connect my laptop to external monitor when using intel.
Eg. when I connect it via HDMI, it cannot see external monitor. However if I switch to nvidia card it sees another display with no problem.

I use latest intel and nvidia (proprietary) drivers.
Does anyone know what might be the problem?

because hdmi is connected to nvidia. Without nvidia you cannot reach that hdmi port at all. Probably you need to use both.

Good point!
As a solution - I tried VGA cable and that works for both cards