Public bug reported:

Running Ubuntu 16.04 64bit, 4.4.8 Kernel on an ASUS Trio with IntelĀ® Haswell 
graphics card and using i915 driver. After upgrade there is no HDMI output to 
the external screen that I use daily. 
I did the following:
- Upgraded to  4.4.8 Kernel hoping that the issue would be resolved.
- Checked for other reports of this issue and followed advise to use NVIDIA 364 
drivers. 
- Checked Intel for the most recent driver which is already packaged with 
16.04;  it is the i915 driver which is in use.
- Used Intel driver update tool to ensure that update is correct.
- Purchased a HDMI adapter to use mini-display port; works and reports HDMI1 is 
in use, but HDMI2 is not recognized (when monitor is plugged in to HDMI2)
- Someone has assisted and has confirmed that there seems to be no hardware 
issues.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1645352

Title:
  No HDMI output after upgrade to 16.04!

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