https://bugs.freedesktop.org/show_bug.cgi?id=90777
--- Comment #5 from Alex Deucher alexdeucher@gmail.com --- (In reply to Itzamna from comment #3)
Hello Alex,
Sadly, your patch does not fix HDMI audio on my machine (kernel 4.0.4; Radeon HD 7970). Reverting commit 8ffea8570d5a7e9dd3c10349ebc3bd79487ae30b does fix the issue.
Sorry, I missed the 7970 part. This patch is not relevant to your board. It should fix James's issue.