I can confirm the same is happening to me at Disco running on Dell XPS
13 9380.

Disabling wakeup for XHC a sort of helps, however, it also disables
wakeup for a touchpad; I suppose this is because pci:0000:00:14.0 is a
USB controller so everything under USB bus is disabled.

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to bluez in Ubuntu.

  System wakes up immediately after suspend if Bluetooth is still

Status in bluez package in Ubuntu:
Status in linux package in Ubuntu:

Bug description:
  After replacing my USB mouse with a BT mouse, I noticed my machine
  would no longer suspend without immediately waking up. i.e. I suspend
  and see the light go into the slow fade in and out for one cycle and
  then goes solid and the display wakes up again. If I disable BT (via
  blueman applet) suspend works fine.

  I've fixed this by shutting down the BT service before suspend, and
  starting it back up on wake, as indicated here:

  Perhaps this script should be included in blueZ as suspend issues seem
  very hard to debug and the immediate wake after suspend could be
  caused many any number of things.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bluez 5.48-0ubuntu3.1 [modified: 
  ProcVersionSignature: Ubuntu 4.15.0-46.49-generic 4.15.18
  Uname: Linux 4.15.0-46-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Apr  3 13:16:14 2019
  InstallationDate: Installed on 2019-02-09 (53 days ago)
  InstallationMedia: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: Intel(R) Client Systems NUC8i3BEH
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic 
root=UUID=9c982b36-8142-4719-810a-e06f81cab223 ro quiet splash vt.handoff=1
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/15/2018
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BECFL357.86A.0051.2018.1015.1513
  dmi.board.name: NUC8BEB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: J72693-304
  dmi.chassis.type: 3
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 2.0
  dmi.product.family: Intel NUC
  dmi.product.name: NUC8i3BEH
  dmi.product.version: J72753-303
  dmi.sys.vendor: Intel(R) Client Systems
   hci0:        Type: Primary  Bus: USB
        BD Address: 00:BB:60:50:92:5D  ACL MTU: 1021:4  SCO MTU: 96:6
        UP RUNNING 
        RX bytes:1912660 acl:106009 sco:0 events:337 errors:0
        TX bytes:12331 acl:74 sco:0 commands:204 errors:0

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