I have passed 3.1 controllers on Intel with no issue and no special effort, just stub it and go.... (Gigabyte GA-X99P-SLI for example)   But with Threadripper X399 I am struggling. The AMD 3.0 controllers pass fine. But if I try to pass the 3.1 Asmedia or 3.1 AMD controllers they seem to work and are recognised by Windows but it gets stuck in a Connect/Disconnect loop discovering my single USB cable which connects my Mouse and Keyboard.   Has ANYONE passed either an AMD 3.1 c