I am unable to have sound playback through HDMI, presumably because there is no PCM codec support with the current state of my driver. An alsa-info.sh dump is below, and below that a pastebin.ca of speaker-test

http://www.alsa-project.org/db/?f=2e2c6ba9f4052ef0a2defc25688067d597737af9

http://pastebin.ca/1567621

Also, changing the PCI ID to 1002aa38 in the two places in patch_atihdmi.c resulted in no sound or mixer device being available when the drivers were loaded. Went back to distro-default drivers afterwards.

Only IEC958 Mute/Unmute control works, rest are permission denied. All permission denied are denied under user and root accounts.

alsamixer defines card as "ATI R6xx HDMI"