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[Phidias <phidias.chiang@xxxxxxxxxxxxx>]

Test on TUSL4-E3-C3 (SKL) is done, the proposed kernel shows positive
result.

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https://bugs.launchpad.net/bugs/1490895

Title:
  Skylake/Broadwell/Haswell: No HDMI audio jack detection in D3

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  This is a long-standing bug for some Haswell, Broadwell and most
  Skylake machines.

  When the HDA audio controller is in D3, a hotplug event (i e, HDMI or
  DisplayPort being plugged in) fails to wake up the audio side so it
  never registers that something has happened.

  By having the i915 driver call directly into the hda driver, the HDA
  driver is always notified that an HDMI hotplug event has happened.

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