I'm trying to get an (old version) UltraFine 5K to work in Windows 10,
- Using a GC-Titan Ridge card
- Gigabyte Z390M, with an i5 9400F (without iGPU)
- AMD Radeon RX 5700
I've got most things working (USB, Audio, image at boot), _except_ 5K resolution. I've done some reading into MST and how the (old) UltraFine uses two DP 1.2 streams. I was certain I could get this to work, since the card has two Mini DisplayPort inputs.
And yet, when I plug those DP > mDP cables, the card only ever detects Mini DisplayPort 1. The second input is never used. I can use all the outputs from the graphics card and they work on the input #1, but the second one just doesn't do anything.
I've got the header, USB, and power cables all properly connect. I'm at the end of my rope and have no idea what could cause this to not work.
I've been reading other people that got Titan Ridge to work, but maybe they only got it to work with the 2019 UltraFine?