Dell XPS 15 - Turned off Keyboard backlight turns on after resuming from suspend

[Bob Merhebi]

On the Dell XPS 15 (2017; 9560) the turned off keyboard backlight turns back on following a suspend.

Ubuntu GNOME

Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

Linux krypton 4.13.0-36-generic #40~16.04.1-Ubuntu SMP
---
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: username 2553 F.... pulseaudio
CurrentDesktop: GNOME
DistroRelease: Ubuntu 16.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=9def3c5c-92fd-4360-a403-30fc2e7e6a96
InstallationDate: Installed on 2017-08-14 (207 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Lsusb:
 Bus 002 Device 007: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 0cf3:e300 Atheros Communications, Inc.
 Bus 001 Device 003: ID 0c45:6713 Microdia
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 15 9560
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-36-generic.efi.signed root=UUID=2149c19b-fca4-49d2-809b-e28952692af2 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-36-generic N/A
 linux-backports-modules-4.13.0-36-generic N/A
 linux-firmware 1.157.17
Tags: xenial
Uname: Linux 4.13.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip kismet libvirtd lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/15/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.7.0
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.7.0:bd12/15/2017:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.sys.vendor: Dell Inc.

[Bob Merhebi (bobmerhebi)]

Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

Linux krypton 4.13.0-36-generic #40~16.04.1-Ubuntu SMP

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1754492

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.16 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'.

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/v4.16-rc4

[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

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[Bob Merhebi (bobmerhebi)]

@Joseph, It existed since I first installed Ubuntu Gnome on this (new) machine back in August.

[Kai-Heng Feng (kaihengfeng)]

Please try kernel in https://people.canonical.com/~khfeng/lp1754492/

[Bob Merhebi (bobmerhebi)]

@Kai-Heng, I've recently reinstalled Ubuntu Gnome and now have kernel 4.13.0-39-generic. Does that suffice? or does it need to be installed from the link you specified?

[Kai-Heng Feng (kaihengfeng)]

Hi, I've built a new one base on latest Artful kernel, please try it:
https://people.canonical.com/~khfeng/lp1754492-2/

[Bob Merhebi (bobmerhebi)]

Thanks. I'll try it this weekend.
Moreover, I'd like to add that when suspended the laptop light remains solid. Wouldn't it be more appropriate to have it "beat"?

Also, I am getting a pcierrors during boot among other problems. I reported them in another bug: https://bugs.launchpad.net/ubuntu-gnome/+bug/1766327

[Kai-Heng Feng (kaihengfeng)]

Which laptop light do you refer to?

I can't find any PCIe errors from the dmesg in the bug report.

Also, I guess it's time to try Bionic (18.04). The GNOME in 16.04 is quite old.