Thanks for the proposed workaround but I have tried this one before (differently) but the result should have been the same, it did not work for me although sound output was slightly more stable.
What I did was going on device manager and uninstall AMD HD Audio Driver for the device and install different ones from the list of available, I even tried all the versions that showed up on the listing including the windows (default) one. But none of them seemed to have work for me.
In any case, I will try your method because I really want sound through HDMI
But lesson learned... When you cheap out on 50 bucks and don't get an Nvidia this is what you get I guess
Stay out of this update it is BSOD to me all the time. Completely breaks Steam's big picture mode.
What a mess, it seems like we are the QA team... I only wish I was still on time to return mine
They only updated display driver but audio driver always 10.0.1.12. I am not sure when they will take a look on this issue. I bought this card for a month but could not use it until now. Fortunately I still have my old card to replace. Really hope they will solve it soon.