Hi,
from http://wiki.x.org/wiki/RadeonFeature
you can see HDMI Audio is currently not supported for evergreen /
N.Islands hardware. This includes everything > AMD Radeon 4xxx.
For now you can use HDMI Audio only with the binary AMD/ATI Driver.
Regards
Gregor Galwas
On Fri, 17 Jun 2011 03:33
I find that if I install the binary ATI driver for my
ATI Mobility Radeon HD 5400 Series card in my Dell
Zino HD, I can get audio out the HDMI port, but if
I use the open source xorg-x11-drv-ati driver I get
no audio.
The utterly mysterious bit is that lspci says the
device is using snd-hda-intel
