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

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.

Faire un dist-upgrade en protégeant un paquet...

Bonjour, Récemment, il y a eu quelques... errances dans Sid. Vu la définition de ce dernier, ce n'est pas illogique, mais ça peut poser quelques soucis. En effet, sur une machine, j'ai programmé des mises-à-jour automatiques pendant la nuit. Sur les 15 derniers jours, Gnome a été désinstallé deux

Sound through HDMI with ATI Radeon HD 4550

Hello, I'm not sure I'm at the right place (please, if not, tell me where I can find a solution...) but I have a problem with multimedia hardware. So, I've changed my graphic card and I've bought an ATI Radeon HD 4550. My goal is to use only an HDMI cable between my computer and my AV amplifier. I