It says in device managaer its an ATI Function Driver for High Definition Audio - ATI AA01.
It also says Legacy Audio Drivers but the actual drivers I had running and using it to control volume and such was VIA Vinyl Audio Deck.
And under Other it has Audio Device on High Definition Audio Bus...
and an uknown..
Do you need the bottom download on this page?http://support.amd.com/us/gpudownload/windows/pages/hdmi_xp.aspx?&lang=English
For me it fixed "other" and "unknown".