ATI Radeon HD 4550 & HDMI : only stereo (with radeonhd) !!!

[David BERCOT <debian@bercot.org>]

Hello,

I have an ATI Radeon HD 4550 on my Debian computer (with radeonhd
driver). The card is linked to my audio-video amplifier through HDMI.
Video is OK and sound is "quite" OK. But, it seems the audio signal is
downgraded to stereo (even DD or DTS flow). Do you have any idea ?

Here is my xorg.conf :
Section "Device"
	Identifier "Configured Video
	Device" Driver "radeonhd"
	Option "DRI"
	Option	 "Audio"	"on"
	Option	 "HDMI"	"all"
EndSection
Section "Monitor"
	Identifier "Configured Monitor"
EndSection
Section "Screen"
	Identifier "Default Screen"
	Monitor "Configured Monitor"
	Device "Configured Video Device"
EndSection

Thank you.

David.