Originally Posted by cehoyos
Do you mean HDMI sound never works for you or that the test files do not work? (Does 8-channel pcm work?)
I was reading on the alsa development list, and from the reports this ion chipset doesn't have the audio channels ordered properly, hardware bug.
Would be interesting to see if you re-order the channels before feeding it to alsa would be sufficient to get HD passthrough working on these GPU.