https://bugs.freedesktop.org/show_bug.cgi?id=101222
--- Comment #7 from Mikko Autio mikko.autio1@gmail.com --- (In reply to James Le Cuirot from comment #6)
(In reply to Mikko Autio from comment #4)
Attached patch fixes multi-channel HDMI audio on my RX 460.
I was about to shower you with praise but sadly that patch made no difference here. :(
Maybe there is something else broken with DisplayPort audio?
I have my receiver plugged into HDMI port of my RX 460 and my TV is plugged into my receiver. Multi-channel audio over HDMI was working fine even without the patch (including AC3/DTS pass-through), but only up to 5.1 channels. Anything over 5.1 channels appeared as stereo on my receiver.
With the patch 7.1 LPCM and DTS-HD/TrueHD pass-through are now working fine.