Public bug reported:

Running Ubuntu 16.10 on an Asus UX51 laptop; i915+Nvidia dual graphics
using the Nouveau driver.

The machine has both VGA out and HDMI out; VGA works like a charm but
HDMI is not even detected. Meaning that none of (xrandr, lspci, aplay,
get-edid) even reports the HDMI port as present.

It's not clear to me whether or not this is an X or a kernel issue at
the heart of it.  I did, however, upgrade recently from 16.04 (where
this bug was also present!) to see if that made any difference (which it
did not) and I did try the proprietary Nvidia drivers (340 and 367) to
see if either of them made a difference (which they did not).

I can assure you that I've read every relevant-sounding bug report and
askubuntu question from the past year on this topic without discovering
any fixes.  Happy to try what needs to be tried.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "lspci output"
   
https://bugs.launchpad.net/bugs/1660949/+attachment/4811692/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1660949

Title:
  No HDMI out on Asus UX51 running 16.10 or 16.04

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