I have an Asus monitor, it has DVI, HDMI, VGA. The HDMI has a quirk, I forget what, so I use a HDMI to DVI cable to connect my laptop to it. And when I switch s

I have an Asus monitor, it has DVI, HDMI, VGA. The HDMI has a quirk, I forget what, so I use a HDMI to DVI cable to connect my laptop to it. And when I switch sources away from DVI, the laptop doesn't think the 2nd display disappeared. So I don't think there's a handshake being done when switching back, because they were holding hands the whole time. I think the quirk was, if I have something plugged into the VGA input, and the HDMI input goes to powersave mode, the monitor "helpfully" says, "Oh, no HDMI signal? Let me switch sources!"