@kali2000
Your HDEF and HDAU layout-id must be the same. In your DSDT, you have HDEF layout-id 28 whereas HDAU has 12. Change HDAU to 28 or just remove it as advised by Hervé, that should fix it.
Hervé, I think you misread, he had to patched port #6(204) to port #7 (306) since as you said port #7 does not exist. With port #7, the HDMI connection works.