The issue is introduced by this commit:
commit a0085f2510e8976614ad8f766b209448b385492f
Author: Sukumar Ghorai <sukumar.gho...@intel.com>
Date:   Wed Aug 16 14:46:55 2017 -0700

    Bluetooth: btusb: driver to enable the usb-wakeup feature

The root cause though, is that some Bluetooth LE advertising events wake
up the BT controller during system suspend.

I am working on a fix that ignores advertising events during suspend.

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https://bugs.launchpad.net/bugs/1799988

Title:
  Missing wifi and bluetooth after sleep on XPS 9370

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