this issue ever gonna be addressed by AMD?
Or it's better to give up dreaming and start looking for HTPC with intel or nvidia, who already support hd audio?
AMD doesn't support Linux except for a bare minimum. Their driver releases are usually half year to years behind the current kernel version. I purchased an A10-5800K for a custom HTPC and was dismayed to see the sorry state of AMD Linux drivers in which no HD audio passthrough is supported. I'll just not purchase AMD products from now on.