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

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https://bugs.launchpad.net/bugs/1659623

Title:
  Shutdown/reboot hang on Dell XPS 15 9550 BIOS 1.2.18+

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On Dell XPS 15 9550 BIOS 1.2.18+, shutdown/reboot job is delayed for
  several seconds in Ubuntu kernel. After shutdown screen appears and
  all shutdown sequence had been done, the power LED turns off; however
  the front LED is flashing in orange for several seconds and the system
  finally turns off. Rebooting is also not working: front LED flashes in
  orange and the system just turns off.

  Switching to mainline kernel 4.9.6, or downgrading to BIOS 1.2.16
  solved the problem. Other Linux distro users didn't observed the
  problem, see also:

  * 
https://www.reddit.com/r/Dell/comments/5przxq/new_dell_xps_15_9550_bios_1219/
  * 
https://www.reddit.com/r/Dell/comments/5l9n3b/xps_15_9550_bios_1218_ubuntu_1610_shutdown_problem/

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-34-generic 4.8.0-34.36
  ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
  Uname: Linux 4.8.0-34-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  psj        5638 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Jan 26 19:17:24 2017
  HibernationDevice: RESUME=UUID=2cfb78ae-e2b8-4d3a-9ab2-a61ae1a79fd1
  InstallationDate: Installed on 2016-01-21 (371 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Dell Inc. XPS 15 9550
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-34-generic 
root=UUID=db90ced3-4cfe-4001-b877-d4aa35e7260f ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-34-generic N/A
   linux-backports-modules-4.8.0-34-generic  N/A
   linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to yakkety on 2016-10-14 (103 days ago)
  dmi.bios.date: 12/22/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.2.19
  dmi.board.asset.tag: ainazi
  dmi.board.name: 0N7TVV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.asset.tag: ainazi
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.2.19:bd12/22/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.

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