Having recently upgraded to a nice new shiny HDMI TV/Monitor for my Fedora 17 server (soon to be 19) I needed to get the HDMI audio working since the TV I purchased claimed to have VGA (even though I wanted to eventually use HDMI) but did not. So had to get the HDMI audio working since there was no other way of getting the audio out of the TV, and I definitely didn't want extra speakers cluttering up the office space.
Realising that the system had already identified the necessary hardware through the System Settings --> Sound it was obvious that no other drivers were required to install the system. Many sites tell you to download the Nvidia drivers, but you don't need to if your monitor is working correctly and if your device is identified in the sound settings.
A simple configuration change is required to GRUB to make the HDMI audio respond.
The only real change required is to add the following to the linux line.
radeon.audio=1
Making your line look as follows;
linux /vmlinuz-3.9.10-100.fc17.x86_64 root=UUID=ff744af5-abdf-4696-a87
b-3e3a5e5e055e ro rd.md=0 rd.lvm=0 rd.dm=0 KEYTABLE=uk rd.luks=0 LANG=en_US.UTF-
8 quiet nouveau.modeset=0 radeon.audio=1
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