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Okay, I just hooked up my dock to my SPro3. I connected the two 4k monitors (configured to 30 Hz in the SPro3 previously) to the dock and the 1080p to the SPro3, the opposite of what I had before. After changing the connector around, it came up just fine. So I can get rid of the MST hub I had...

To get the internal display to shut off you need to make one of the other displays the main display and then you can shut it down. But you shouldn't have to do that as it should drive the three displays fine.

Displayport 1.2 link is limited to a single 4k monitor at 60 Hz. Driving Multiple Displays from a Single DisplayPort Output - DisplayPort That is why the important point is how many links are coming out of the connector. If it is only a single DP 1.2 link, then it cannot drive two 4k at 60...

What you might try is setting up the 4ks at 30 Hz. I have 2 4k monitors and a 1080p monitor off my SPro3. I use an MST hub for the 2 4ks connected directly to the Surface and the 1080p to the SPro3 dock. To get it running with the 2 4ks, first one came up at 4k 60 Hz, I set it to 30 Hz and...