Any usage of HDMI, DVI, or VGA breaks the DP MST daisy chain. The second monitor in the DP MST daisy chain must have DP in or mDP in. You cannot daisy chain from the UP3017 to the 2407WFP. Optiplex 5060 #1 DP out port --> DP to mDP cable --> First UP3017 mDP in port (MST On) First UP3017 DP out port --> DP to mDP cable --> Second UP3017 mDP in port (MST Off)   Optiplex 5060 #2 DP out port --> DP to DVI cable --> 2407WFP DVI in port-or-Optiplex 5060 #2 DP out port --> DP to DP cable --> DP to DVI converter --> 2407WFP DVI in port
I have an Optiplex 5060 PC at work which has (2) DisplayPorts. I have a (2) Dell UP3017s as my main working monitors and they are connected to each of the (2) DisplayPorts on the PC. I want to add a 3rd monitor into my workflow and being in a secured environment, I have very few options. I am aware that these monitors have DP MST, a type of passthrough technology, which should allow me to daisy chain the (2) UP3017 monitors together resulting in discrete and separate displays, leaving me the 2nd DisplayPort on the PC for my 3rd monitor. I had a DP-->DP cable laying around and tried it but could not get the 2nd UP3017 monitor to see the signal. Is there a "special" DP -->DP cable I need to be looking for that supports DP MST and if so, what are the criteria I am looking for? If any cable works, are there settings on the 2nd monitor I need to be setting to allow it to function in this daisy chain? Any help appreciated.
UP3017, DP MST functionality