** Description changed:

  When I connect the usb hub built into my monitor
  (http://www.samsung.com/uk/support/model/LS27D85KTSN/XU), the system
  will reboot instead of shutting down when I do a shut down. If I disable
  XCHI in the BIOS, the problem does not happen. If I disconnect the hub
  and enable XHCI, the problem does not occur.
  
- Release info:
- 
- Description:  Ubuntu 16.04.1 LTS
- Release:      16.04
- 
  Outputs of various commands are attached.
  
  Possibly related bugs:
  https://bugzilla.kernel.org/show_bug.cgi?id=76291
  https://bugzilla.kernel.org/show_bug.cgi?id=66171
+ 
+ WORKAROUND: Use kernel parameter: xhci_hcd.quirks=0x0004b810
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-31-generic 4.4.0-31.50 [modified: 
boot/vmlinuz-4.4.0-31-generic]
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  hmahmood   3688 F.... pulseaudio
-  /dev/snd/controlC0:  hmahmood   3688 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  hmahmood   3688 F.... pulseaudio
+  /dev/snd/controlC0:  hmahmood   3688 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Jul 24 11:18:09 2016
  HibernationDevice: RESUME=UUID=0477be12-31b0-423b-9277-22490ca71561
  InstallationDate: Installed on 2016-07-23 (1 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=503e032f-c205-4594-a47f-cdc58ffa5dba ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-4.4.0-31-generic N/A
-  linux-backports-modules-4.4.0-31-generic  N/A
-  linux-firmware                            1.157.2
+  linux-restricted-modules-4.4.0-31-generic N/A
+  linux-backports-modules-4.4.0-31-generic  N/A
+  linux-firmware                            1.157.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/06/2016
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0358.2016.0606.1423
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0358.2016.0606.1423:bd06/06/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:

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https://bugs.launchpad.net/bugs/1606030

Title:
  System reboots instead of shutting down if xhci is enabled in BIOS and
  USB hub is connected

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