Confirm this issue too.

laptop : dell xps 15 9550
linux : 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux
bluetooth device :
Device    xxxxxxxxxxx (public)
        Name: Bluetooth Mouse M557
        Alias: Bluetooth Mouse M557
        Class: 0x00002580
        Icon: input-mouse
        Paired: no
        Trusted: yes
        Blocked: no
        Connected: no
        LegacyPairing: yes
        UUID: Service Discovery Serve.. (00001000-0000-1000-8000-00805f9b34fb)
        UUID: Human Interface Device... (00001124-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v046DpB010d1001
        RSSI: -36


May 16 09:35:55 joelin-XPS-15-9550 kernel: [  124.383807] Bluetooth: hci0: last 
event is not cmd complete (0x0f)
May 16 09:35:57 joelin-XPS-15-9550 bluetoothd[1053]: Can't get HIDP connection 
info
May 16 09:35:57 joelin-XPS-15-9550 bluetoothd[1053]: connect error: Connection 
refused (111)
May 16 09:36:11 joelin-XPS-15-9550 kernel: [  140.255753] Bluetooth: hci0: last 
event is not cmd complete (0x0f)

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https://bugs.launchpad.net/bugs/1748565

Title:
  Kernel regularly logs: Bluetooth: hci0: last event is not cmd complete
  (0x0f)

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  dmesg:
  [ 3363.056494] Bluetooth: hci0: last event is not cmd complete (0x0f)

  Regards,
  --
  Cristian

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-9-generic 4.15.0-9.10
  ProcVersionSignature: Ubuntu 4.15.0-9.10-generic 4.15.2
  Uname: Linux 4.15.0-9-generic x86_64
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  caravena   1811 F.... pulseaudio
  CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
  Date: Fri Feb  9 20:35:29 2018
  InstallationDate: Installed on 2017-10-13 (119 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-9-generic 
root=UUID=707d0f89-4b1d-4432-9d50-6058dc4c1ee9 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-9-generic N/A
   linux-backports-modules-4.15.0-9-generic  N/A
   linux-firmware                            1.170
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.family: ChiefRiver System
  dmi.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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