The U2913WM User's Guide is here. Page 43 states,
PBP Settings = This function brings up a window displaying image from another input source. Thus you can watch two images from different sources at the same time.
Notice it mentioned, "from another input source", and "from different sources".
The way I read that, two sources would be like =
One computer, one Xbox
Once Computer, one PS4
But not two video out ports from ONE computer.
So explain all of the hardware you are trying to use on this U2913WM. And how that hardware is connected to the U2913WM.
Thank you for the reply, Chris.
I read the user's guide but my reading comprehension failed. I used a DP and a DVI-D connection from one computer and the result was very strange indeed. Fortunately, God makes allowances for drunks and idiots and no damage was incurred.
Perhaps an active adapter would be a work-around for using PBP mode with a single computer. If anyone has tried this, I'd like to know how it worked out.