This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1764684

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1764684

Title:
  Fix an issue that some PCI devices get incorrectly suspended

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  ===SRU Justification===
  [Impact]
  Some PCI device are not power managed by system firmware get runtime 
suspended incorrectly. In this case it's an xHC device, which can't be woken up 
by plugging USB device.

  [Test]
  With the patch, the xHC no longer get put to suspend incorrectly. USB devices 
can work on the xHC now.

  [Fix]
  We need to check if the device is power managed by system firmware, also if 
it supports PME from D3hot.

  [Regression Potential]
  Low.
  It fixes a regression caused by the PM core refactor.

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