U4320Q, PBP screen setup

Question

Hello. I have a U4320Q with two inputs: The setup: two PCs, a Windows 10 Enterprise-Radeon card MiniDP to DP and an older Windows 7 motherboard DP to DP. Drivers and Dell Manager are up to date. I'm trying to set up the screen as a 4-square with the Windows 7 as one upper-right square and the Windows 10 in the other three squares. The issue: if I use PBP, Windows 10 machine windows open under the Windows 7 screen and are hard to access; this makes sense because that would be a standard PIP mode.  But, if I use the PBP, the layout is perfect except the three Windows 10 screens will only appear as duplicate screens instead of being able to function as extensions.  The question: How can I change the duplicated screens to act as extended screens?  It doesn't make sense that I would want to duplicate a screen multiple times on the one big monitor, so I'm thinking that's not the expected behavior.   Thanks for any help. I'm not at those PCs at the moment, so I'll need to get the Radeon model if that's possibly the issue. I'm hoping I'm just missing a setting. John

jphughan · Accepted Answer

@SRECJohn  I'm pretty sure that if you want to run PBP with a single source filling more than one 'tile' and not mirroring them, you have to have separate cable connections from the source system for each tile, so that the source system essentially sees those 3 tiles as 3 completely independent displays.  In theory since you're using DisplayPort, which supports DisplayPort MST (running multiple independent displays from a single cable), that single connection COULD allow you to run those 3 tiles independently over a single connection, but that would require the display itself to support presenting 4 independent tiles on its DisplayPort input, and I'm betting it doesn't.  Typically DisplayPort MST is used to run multiple physically independent displays as a daisy chain all driven from a single source port.  But the U4320Q has two DP inputs, two HDMI inputs, and a USB-C input.  So does your Win10 machine have 3 outputs that you can use to drive 3 of those inputs?

jphughan · Answer

@SRECJohn Correct.  Or of course you could have two mDP to DP and one mDP to HDMI from your Windows 10 system if the Windows 7 system can be moved over to one of the HDMI inputs on the display, if that would be more convenient based on the cables you have available.  Then it's just a matter of getting each input assigned to the desired area of the display.

SRECJohn · Answer

It does. The Radeon card has 4 mDP out ports. You are suggesting adding two more out cables, mDP to HDMI?

SRECJohn · Answer

Perfect.  Thanks.  I've got one on hand.  I'll give it a try here shortly.

SRECJohn · Answer

Sorry for the delayed response.  That was exactly what it needed was one cable for each 'monitor' appearance on the screen.

jphughan · Answer

@SRECJohn  Excellent! Thanks for reporting back, and glad you've got a solution.

Monitors

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