I am sorry to hear you are having problems with the HDMI audio in your system but let me help you.
Please note that the only validated operating system from our side for the GMA 3600 Series is Win 7 32 bit. You can try other operating system but we do not guarantee the correct functionality.
My recommendation is to install the validated operating system to discard issues.
In fact, here is the current status of the open source driver support of cedarview. This is a shame, seriously. My computer is running ubuntu 12.04, in 32 bits even though the cpu is a 64, because the current driver can and wil only work with a 3.2 kernel. No, I do not like Windows, and I think I should have the right to choose whatever plaform suits me without being dictated what to use because Intel dropped/never offered real support for cedarview.
Intel Linux Graphics - No Intel card on Atom N2100 | Linux Graphics
Please guys. Please cooperate with the open source scene.