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I tried the following steps to get my HDMI sound output working under 14.04:

  1. GRUB_CMDLINE_LINUX="radeon.audio=1" in /etc/default/grub
  2. sudo update-grub
  3. Go to ALSA daily build snapshots
    1. Select "oem-audio-hda-daily-dkms - 0.201404230703~ubuntu14.04.1"
    2. In "Package Files" download the .deb-file
    3. Install the .deb-file on your system
  4. Restart the system

This doesn't work for me. FYI my Radeon is a 5750 series card.

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