(In reply to Alex Deucher from comment #2) > Created attachment 116221 [details] [review] [review] > proper fix > > The CRC registers don't need to be programmed. The driver was just updating > the wrong register when setting up the ACR packet control. 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. - Itzamna