verified on my BYT NUC

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1616894

Title:
  [BYT] display hotplug doesn't work on console

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  Baytrail (server) machines can't be booted up without a display
  connected, because hotplug doesn't work (X kinda works around it).
  This has been fixed upstream in v4.8-rc1, four commits need to be
  backported:

  4570d833390b100 drm/i915/vlv: Make intel_crt_reset() per-encoder
  4c732e6ee9e7190 drm/i915/vlv: Reset the ADPA in vlv_display_power_well_init()
  21842ea84f161ae drm/i915/vlv: Disable HPD in valleyview_crt_detect_hotplug()
  84c8e0963da434d drm/i915: Enable polling when we don't have hpd

  Test case:

  1.
  - boot without a display attached
  - switch to vt1
  - attach the display
  - hit a key, the display should wake up

  2.
  - boot with a display
  - switch to vt1
  - detach & attach the display
  - hit a key, the display should wake up

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