I'm trying to setup a duplicate display on Windows 7, on a Lenovo W520 laptop. The goal is to output the main desktop to both the laptop screen and a VGA projector. I believe the laptop has a dual video card setup, one Intel card and one NVIDIA card.
So far, Extend works, as does projecting to just the monitor or just the projector. However, when using duplicate, the picture only ever shows up on the laptop screen.
I have tried every option I can find in the Windows displays panel, in the NVIDIA control panel, and in the Intel Control panel. Nothing seems to accomplish this.
I'm thinking the problem has to do with the two different video cards, but I'm not sure. Has anyone tried this before?
Incidentally, in the Windows control panel, the only options shown for duplication are "Duplicate Desktop on 1 and 2" (does not duplicate), "Extend desktop on 1 and 2", and "Show Desktop only on 1" (or 2). None of these are the right option.