HDMI Audio output problem

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http://askubuntu.com – I'm running Ubuntu 12.10 and having trouble with the audio output through HDMI on my Acer Aspire one 722. It's using an AMD c-60. I was able to add in the radeon.audio=1 kernel parameter, which was supposed to enable HDMI audio playback but even after running update-grub and rebooting, the problem persists when I choose HDMI as the audio output after plugging in my HDMI cable. At this point, I'm not sure what else to do. (HowTos)