Welcome
In my case the problem were solved on one's own.
I got installed two VIDEO cards on lenovo thinkpad W520, but in device manager I saw only ONE (depends on BIOS setup).
And I got a choice. 2 displays (second on VGA) on NVIDIA or black screen on Intel
Yesterday i got a case. In my work I tried to connect display on VGA - unsuccessfull.
During this connection I switched the laptop in sleeping mode. After that I connected HDMI in my home and turned on computer.
Finally I saw two video cards in my computer. The option "run with graphics process" is available and I can connect VGA display port.