The HDMI output seems to be associated with the nvidia card:
You may want to look at bumblebee: https://wiki.ubuntu.com/Bumblebee
Even if you can't get HDMI working, it should give you better battery life by 
shutting off the nvidia card when not in use.

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https://bugs.launchpad.net/bugs/1162050

Title:
  Hdmi out not recognised

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