Can you please copy (as root):

  /var/log/lightdm/unity-system-compositor.log*
  ~/.cache/upstart/unity8.log

and attach them here?

That should show attempts to reconfigure displays (if Mir is being
notified at all)

** Package changed: unity8 (Ubuntu) => mir

** Tags added: android multimonitor

** Summary changed:

- No hdmi output connected to a dell monitor
+ No HDMI output connected to a Dell monitor

** Summary changed:

- No HDMI output connected to a Dell monitor
+ No HDMI output when frieza is connected to a Dell monitor

** Changed in: mir
       Status: New => Incomplete

** Also affects: mir (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: mir (Ubuntu)
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1639255

Title:
  No HDMI output when frieza is connected to a Dell monitor

Status in Mir:
  Incomplete
Status in mir package in Ubuntu:
  Incomplete

Bug description:
  Environment:

  current build number: 75
  device name: frieza_arm64
  channel: ubuntu-touch/staging/ubuntu
  last update: 2016-11-04 10:44:56
  version version: 75
  version ubuntu: 20161104
  version device: 20161014.0
  version custom: 20161104

  Steps to reproduce:

  1º Connect hdmi cable to my dell monitor
  2º Select hdmi port

  Current result: I get a black screen with my dell monitor but it works 
correctly on a Lg tv
  Expected result: dell monitor should display tablet screen

To manage notifications about this bug go to:
https://bugs.launchpad.net/mir/+bug/1639255/+subscriptions

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