madbiologist, unfortunately this is not the case for as recent as 3.13-rc2 due 
to commit 108dc8e8b44a4c64ac53676cc05f6234340ccd4a so testing at this point is 
unnecessary:
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.

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https://bugs.launchpad.net/bugs/1186879

Title:
  AMD Radeon HD 6250/6480G, No HDMI audio output with radeon driver by
  default

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