Try adding radeon.audio=1 to the GRUB_CMDLINE_LINUX_DEFAULT line in 
/etc/default/grub (inside the quotations)
Then run:
sudo update-grub
Reboot.

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https://bugs.launchpad.net/bugs/1176285

Title:
  [GA-880GM-UD2H, ATI RS690/780 HDMI, Digital Out, HDMI] No sound at all

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