HDMI no sound

"HDMI Audio is disabled by default on kernel 3.0+ due to a black screen on some monitors.

To get audio working again go to:
etc/default/grub
Open grub as administrator with a text editor.
Then change the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"
Type on the terminal:
sudo update-grub
Reboot and your HDMI sound will work again."

http://community.linuxmint.com/tutorial/view/1051

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