Re: Problem connecting my XPS15 laptop to my u2412m monitor via displayport
I have the same problem, although I use an HDMI to DVI cable. My XPS 15 laptop can't connect to the u2412m monitor. The monitor just goes into Power Save Mode.
A different external monitor works fine with the XPS laptop (using the same cable). A different laptop works fine with the u2412m monitor (using the same cable). So it looks like a compatibility problem.
I solved the problem by buying a Mini DisplayPort to DisplayPort cable. With this cable everything works fine for me.
This is to show that a different cable may do the trick. Maybe for you it is the other way around, and that it only works with an HDMI to DVI cable. However, this is just a guess!