hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec,
available: no)

it is not available ,

1) disabled by the graphic driver 
2) your HDMI TV EDID not valid


post output of alsa-info.sh


xrandr --verbose

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https://bugs.launchpad.net/bugs/1311939

Title:
  alsa-driver no HDMI audio on Ubuntu 14.04

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