Comment 31 for bug 897008

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madbiologist (me-again) wrote : Re: HDMI: no sound

molecule-eye - The radeon.audio=1 parameter is only applicable when using the open-source radeon driver, and not when using the closed source Catalyst driver. This probably explains the error you are getting.

What falstaff was saying is that when they added the radeon.audio=1 parameter to their kernel boot options it caused the HDMI adapter to be added to the list of chooseable output devices in the Pulseaudio (Sound configuration) dialog.