Here's a list of unsupported HDMI Audio Device 8086:0c0c, 8086:9d70, 8086:9d71, 8086:9d74, 8086:a170, 8086:a171, 8086:a2f0, or 8086:a348
Try adding
FakePCIID.kext + FakePCIID_Intel_HDMI_Audio.kext
Even thought WEG suppose to fix it, I still have to add them on my Precision 5510