ATI/AMD does not internally use ELD but analogous custom stuff. But as noted, the HDA driver on this kernel does not support reading it, it is a 3.12+ feature (though note that writing the info is disabled in 3.12 radeon video driver on some cards).
A typo here, AMD stuff is a 3.13+ feature.
New logs.
I hope this time I got it right:
zcat /proc/config.gz : CONFIG_SND_DEBUG=y CONFIG_SND_DEBUG_VERBOSE=y CONFIG_SND_PCM_XRUN_DEBUG=y CONFIG_SND_DYNAMIC_MINORS=y
Did you pass the output of alsa-info.sh and eld to the alsa-devel mailing list ?
Codec: ATI R6xx HDMI Address: 0 AFG Function Id: 0x1 (unsol 0) Vendor Id: 0x1002aa01 Subsystem Id: 0x00aa0100 Revision Id: 0x100300
seem that your codec may get Audio-Video Association Port ID and Sink Information for your DENON-AVAMP
Do pulseaudio show four available HDMI ports ?
pactl list
Do pulseaudio select the first HDMI as active port the default sink ?
pactl stat