For HDMI to work, you need to update /ext/X11/xorg.conf https://bugs.launchpad.net/linaro-landing-team-samsung/+bug/906762
Can you test whether HDMI audio is working when HDMI display is functional? If so, it would be better to rename this bug as "Origen: Ubuntu: There is no option to select HDMI audio output".
For HDMI to work, you need to update /ext/X11/xorg.conf /bugs.launchpad .net/linaro- landing- team-samsung/ +bug/906762
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Can you test whether HDMI audio is working when HDMI display is functional? If so, it would be better to rename this bug as "Origen: Ubuntu: There is no option to select HDMI audio output".