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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1489292

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/1489292

Title:
  System cannot detect USB device in BAT mode

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

Bug description:
  [Impact]

  On some Skylake-U platforms, if boots with battery only and has no USB
  device connect, after boot the USB port can't be used, even though the
  xHCI Host Controller doesn't report any error in dmesg. The USB device
  looks like doesn't turn on, LED on USB mouse or keyboard doesn't light
  up.

  [Fix]

  There's a fix in mainline v4.2-rc3, though it states the fix is for
  Braswell, but the uuid use in the commit can also be found on
  Skylake-U platforms.

  Commit log is as follows:

  commit c3c5819a350952439c3198aa46581f9e4c46557f
  Author: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
  Date:   Tue Jul 21 17:20:25 2015 +0300

      xhci: call BIOS workaround to enable runtime suspend on Intel
  Braswell

      Intel xhci hw that require XHCI_PME_STUCK quirk have as default disabled
      xhci from going to D3 state in runtime suspend. Driver needs to verify
      it can deal with the hw by calling an ACPI _DSM method to get D3 enabled.

      Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
      Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

  [Test]

  1. Install the patched kernel
  2. Boot with battery
  3. Insert a USB device (disk, keyboard, mouse), should work normally

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