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In 13.04 HDMI sound never worked until I did the following..

sudo gedit /etc/default/grub

Edit the line:

GRUB_CMDLINE_LINUX=""

to

GRUB_CMDLINE_LINUX="radeon.audio=1"

Run:

Sudo update-grub

Restart the system.

Since upgrading to 13.10 the sound is distorted -- squeaky and seems to be in super fast forward. Any ideas on how to fix my HDMI sound?

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This was solved after the most recent kernel updates. Thanks ubuntu programmers! –  deanresin Oct 24 '13 at 18:52
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