Please update your alsa drivers, as outlined here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. Once you
have done so, please check whether you get audio via the HDMI port from
your computer.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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no sound MCP73 hdmi port ubuntu 10.04 lucid
https://bugs.launchpad.net/bugs/635391
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