Personally, I don't care what AMD does to drag their feet over official HDMI audio support. The reverse engineered support works well enough for me. Though it is a shame that some people boot up with blank screens while AMD's "open source" people claim they need to go to the magical land of AMD lawyers and ask the Imaginary Property fairy for permission on documenting how it's supposed to work.
At least the people who reverse engineered it gave us something without having to put us on hold for 3 years over their alliances with criminal organizations.
"reverse engineered support " works only for hd2000-hd4000