https://www.tonymacx86.com/threads/applehda-hdmi-audio-guide.234735/
Downloads
Fake-PCI-ID
Clover config.plist files for common Intel graphics configurations
Installation
Downloads/FakePCIID.kext and FakePCIID_Intel_HDMI_Audio.kext to /Library/Extensions with KextBeast
Edit EFI/CLOVER/config.plist, paste config_HDxxxx.plist/ (see above link, Clover config...):
ACPI/DSDT/Patches/ (change HDAS to HDEF, 300/200/100 Series only)
ACPI/DSDT/Patches/ (change GFX0 to IGPU, all Intel HD Graphics)
ACPI/DSDT/Patches/ (change B0D3 to HDAU, 9/8 Series only)
ACPI/DSDT/Patches/ (change HECI to IMEI, 300/200/100 Series only)
Devices/AddProperties (IntelGFX/hda-gfx=onboard-1 for HDMI audio, all Intel HD Graphics)
Devices/AddProperties (HDA/hda-gfx=onboard-1 for HDMI audio, 300/200/100/7/6 Series only)
KernelAndKextPatches/KextsToPatch/ (HDMI audio, ... 0x ..., 0x ..., framebuffer patch, all Intel HD Graphics)
Restart