Actually it is video card related. You need to have one that supports HDMI pass through.
The standard 'Radeon' driver doesn't support HDMI sound pass through. The get that you must install the Radeon HD video driver and configure it for Audio support manually - since it doesn't automatically detect HDMI sound capable devices yet.
apt-get install xserver-xorg-video-radeonhd
Then configure xorg.conf so that it contains the following settings:
Actually it is video card related. You need to have one that supports HDMI pass through.
The standard 'Radeon' driver doesn't support HDMI sound pass through. The get that you must install the Radeon HD video driver and configure it for Audio support manually - since it doesn't automatically detect HDMI sound capable devices yet.
apt-get install xserver- xorg-video- radeonhd
Then configure xorg.conf so that it contains the following settings:
Section "Device"
Identifier "ATI Radeon HD 3200/RS780"
Driver "radeonhd"
Option "DRI" "On"
Option "Audio" "On"
Option "HDMI" "all"
EndSection
Section "DRI"
Mode 0666
EndSection
(Change the Identifier as required so that it ties in with the rest of the configuration).