I was about to create an upstream report, but I cannot reproduce the
issue with the newest mainline 4.16.0-041600-generic.

** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Triaged => Confirmed

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  Bluetooth stops working when wifi is in use

Status in linux package in Ubuntu:

Bug description:
  Steps to reproduce:

  1) Both Bluetooth & wifi is enabled in settings, but nothing is connected.
  2) Connect a Bluetooth device, e.g., a mouse. It works.
  3) Connect to a wifi network or create a wifi hotspot.

  Expected result:

  Both wifi and Bluetooth works, i.e., I can browse internet through the
  wifi connection, and my Bluetooth mouse still works.

  Actual result:

  - Wifi works, but the Bluetooth mouse stops working although it is still 
"connected" in Bluetooth settings.
  - Any attempt to disconnect & reconnect the mouse fails.
  - `systemctl restart Bluetooth` sometimes fails (see dmesg-hci-fail.txt), and 
then the system cannot be powered off

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-25-generic 4.13.0-25.29
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
   /dev/snd/controlC0:  fenryxo    1999 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu Jan 18 11:34:44 2018
  InstallationDate: Installed on 2018-01-10 (7 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 003: ID 04f2:b5e2 Chicony Electronics Co., Ltd 
   Bus 001 Device 002: ID 04f2:b5e1 Chicony Electronics Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HP HP Spectre Laptop 13-af0xx
   0 EFI VGA
   1 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic.efi.signed 
root=UUID=e1e101f8-add8-4b5d-969d-c539be21e36f ro no_console_suspend 
initcall_debug resume=/dev/nvme0n1p3
   linux-restricted-modules-4.13.0-25-generic N/A
   linux-backports-modules-4.13.0-25-generic  N/A
   linux-firmware                             1.169.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2018-01-10 (7 days ago)
  dmi.bios.date: 10/13/2017
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.06
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 83A2
  dmi.board.vendor: HP
  dmi.board.version: 55.24
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.product.family: 103C_5335KV HP Spectre
  dmi.product.name: HP Spectre Laptop 13-af0xx
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP

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