That seems to have worked with getting the UHD 630 to show up in VideoProc. Still don't see any airplay menu option though.
View attachment 403181
Is your Apple TV on the same network?
Ah that's my mistake. I was under the assumption that the menu would show up regardless if I had an Apple TV connected or not (I have one, it's just sitting in my closet right now). Thought I read somewhere that it was a good indicator towards a fully working system. My bad!
Btw, if/when you ever need/want to pull out your RX 580 and just use IGPU or change to a different graphics card (assuming it's supported by macOS), you can now do so without making any changes because you've removed all the fixed settings and now allowing the system to detect what hardware you are using. Imo, this is a much more elegant solution to how you were doing it before.
I just have to say, this thing is running so great on iMacPro 1,1 - even with the RX 580 in there.
Something changed, maybe it's just the 10.14.5 beta 3, but my RX 580 fans are tamed completely now and dead silent and off unless temps call for some action.
Oh this only applies IF one is running macOS 10.14.4 (18E2034) "Special Build?" Everyone else needs to have the ig-platform-id specified?18E2034