I'm having difficulty getting my HDMI audio to work.
1. Disabled onboard audio(I dont use it anyway)
2. Upgraded WhatEverGreen and AppleALC to the latest.
I only have my USB headset as an output.
Otherwise I have USB mapped etc. Everything else is working perfectly, H/W...
Relative success with a Ryzentosh build with a Gigabyte B450M DS3H. Everything work on first boot.. and 50% of the time suspend resume works, but otherwise random USB devices stop working. I'm on iMacPro1,1 and the latest OC. with Ethernet only via PowerLine.
I've done a USB mapping via...