Yeah but I read somewhere that Realtek HDMI driver MAY have issues with PDVD and TMT3. Also, that tutorial may have preceded the latest Catalyst driver...hence perhaps HD audio bitstreaming has been fully covered by Catalyst since the 5xxx series was released. Can you try to remove Realtek ATI HDMI Driver first and rely solely on Catalyst 10.6? Cheers!
I uninstalled Realtek and installed the latest ATI Catalyst HDMI Audio driver. I selected ATI HD Audio device. When I clicked on configure, the choice was only 2 channel stereo for speakers. On Realtek, there was 2 channel, 5.1, 7.1. When I clicked on Properties then Supported Formats, it says "No Uncompressed Format supported". On Realtek, there was DD, DTS, DTS-HD, DDPlus, DTS-MA.
Anyway, I still played some files using PDVD10. While playing a BD, information was enabled and it shows that the Audio is Dolby TrueHD and Audio Output is LPCM. When I ran through the surround options of the receiver, MultiCH wasn't displayed. It only displayed the analog audio options such as Dolby Prologic 2, Neural THX 7.1, etc. There wasn't even DD/DTS.
I played MKVs using PowerDVD. In the ONscreen info, the audio showed DTS and Audio Output: Unknown. In the receiver, only the analog audio options were displayed and no DD/DTS.
I played AVI files with only 2channel audio. The sound and dialogues had an echo.
Reverted back to the Realtek ATI HDMI Audio driver but It didn't go back to the previous settings.