Ubuntu – HDMI with opensource drivers (radeon)

alsaatihdmisound

My system (E45M1-I Deluxe with AMD onboard graphics with 4GB RAM) running Ubuntu 12.04. My problem is I have no HDMI sound if using the opensource drivers instead of fglrx.

I tried:

  • to remove and purge all alsa-base and pulseaudio packages and reinstalling alsa.
  • resetting audio settings with dpkg --configuration -a
  • adding GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1" to grub config
  • enabling the device via alsamixer, although I only see S/PDIF instead of HDMI
  • editing asound.conf with the card and device number

I uploaded all sound based info via alsa-info here

Are there recommended steps to go about installing HDMI sound?