Nothing has changed unfortunately, thanks for what you’re trying to do anywayTry with this.
I hope I made the right fileDisable the HDMIAudio kext and reboot then send me an IOReg.
Unfortunately still no luck, can’t see hdmi as an audio outputThere's no HDAU loaded there. Try with this. I've adapted an SSDT to hopefully work on your system.
I've followed the steps, but still no HDMI Audio output. the only difference is that the kext is loaded from system instead from EFI. I want to underline that the audio was already working, but only using the standard green jack of the pcI see the issue. Just realised you are using Big Sur lol. There's an issue with VoodooHDA on Big Sur. Here's a work around from the developer, https://www.insanelymac.com/forum/topic/314406-voodoohda-297/page/20/?tab=comments#comment-2756841
Update: It says bad code signatureI've followed the steps, but still no HDMI Audio output. the only difference is that the kext is loaded from system instead from EFI. I want to underline that the audio was already working, but only using the standard green jack of the pc
Still no luck, I guess it’s because I’m using a cable which convert DVI to HDMITry with this version. Use the method Slice suggested and remove it from your EFI.