https://bugs.freedesktop.org/show_bug.cgi?id=33399
Christian König deathsimple@vodafone.de changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |INVALID
--- Comment #5 from Christian König deathsimple@vodafone.de --- Sorry I obviously have missed this bug.
The audio codec of the RV630 mentioned in this bug can only handle two channels, so the hardware simply doesn't support this.
Later hardware generations do support HDMI multichannel audio.