Fabrizio Gennari, the WORKAROUND documented in 
https://help.ubuntu.com/community/RadeonDriver#HDMI_Audio would be the current 
method of enablement going forward due to commit 
108dc8e8b44a4c64ac53676cc05f6234340ccd4a so further testing at this point is 
unnecessary. I'll mark this Triaged for now, and we can keep an eye on upstream 
progress towards this chipset:
Author: Alex Deucher <[email protected]> 2013-10-14 12:17:50
Committer: Alex Deucher <[email protected]> 2013-10-18 15:16:19
    drm/radeon: rework audio option
    In 3.12 I changed audio to be enabled by default, but you still had to turn 
it on via xrandr. This was confusing to users so change it to minic the 
previous behavior:
    - audio option is set to -1 (auto) by default which is the current 3.12 
behavior (audio is enabled but requires xrandr to turn it on).
    - if audio = 1, the audio is enabled without needing to mess with xrandr 
(previous behavior)
    - audio = 0 disables audio
    It retains the new feature of allowing the user to enable audio on the fly 
with xrandr, but turns audio on automatically if radeon.audio=1 is set which is 
what most users expect.

** Changed in: linux (Ubuntu)
   Importance: Medium => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-bug-exists-upstream-v3.13-rc3

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https://bugs.launchpad.net/bugs/897008

Title:
  1002:9715 HDMI: no sound

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