Toleda:
I just updated to 10.13.5 and my HDMI audio is dead. I am testing an XFX Radeon Vega 64, just so you know, and it and HDMI audio was working just fine with 10.13.3 and even 10.13.4. I've tried a new AppleALC, tried to build a new SSDT-HDMI.aml, tried reverting to the previous AppleHDA, tried a bunch of things, and it's a no-go.
Audio through the green port on the back of the motherboard does work, but HDMI audio is dead. Booting back into 10.13.4 and the HDMI audio on the Vega works.....
Before I do a bunch of postings on this, do you want to work with me on this? Do you think you can help me with this?