Another day, another linux distro and another issue with Ubuntu variants and the hardware in my new Acer Aspire V5. However, this time it is with UbuntuGnome and HDMI audio not working at all. There are countless questions and answers strewn about the web about HDMI Audio Out just not working (including numerous on AskUbuntu). Unfortunately all of what I found was a lot of speculation (regretfully the original posters never seemed to comment back on what worked for them). I did end up finding something that worked for me, so I figured I’d share it in the hopes that someone else finds it useful!
The gist of the fix is to use the latest alsa drivers (in my case I opted for the dailies so, as usual, your mileage may vary). I have seen recommendations both ways to add it as a ppa or just download the requisite deb package; I ended up going with the ppa approach:
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With any luck you will have working HDMI audio after the restart!