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

[Shinjo Park]

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.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream stable kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.8 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.17/

[Shinjo Park (peremen)]

I tested both 4.8.17 and 4.9.6 mainline kernel, shutdown/reboot both works fine there. However 4.8.0-34-generic Ubuntu kernel still has the problem.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test this latest kernel and post back if it resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed.

Thank you in advance!

[Shinjo Park (peremen)]

If I choose the right version, shutdown and reboot went normal on kernel version 4.8.0-38-generic.

[Ang Bongsong (notinsideofhereiamnotinside)]

I was experiencing the exact same issue on my Precision 7510 under Xenial, after transitioning to the rolling HWE & Kernel stack. On a hunch I added the Canonical Kernel Team PPA (https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+packages) so I could upgrade from kernel 4.8.0-36 to 4.8.0-37. Now shutdown and reboot are working perfectly. Not sure if I should file a separate bug report.