Ubuntu
linux package

Keyborad backligt does not work

Bug #1829095 reported by Chris Martin on 2019-05-15

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

I have a dell XPS14 (L421X). In releases 18.04 and lower the keyboard back light used to work. However in 18.10 and 19.04 it does not

The dell_laptop model is loaded.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubuntu-desktop 1.431
ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
Uname: Linux 5.0.0-15-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed May 15 11:44:51 2019
InstallationDate: Installed on 2019-04-23 (21 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: ubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: cmartin 2046 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2019-04-23 (23 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: Dell Inc. XPS L421X
NonfreeKernelModules: nvidia wl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-15-generic root=UUID=994f28ca-26f0-46f9-9e20-27bb85872aa0 ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
RelatedPackageVersions:
linux-restricted-modules-5.0.0-15-generic N/A
linux-backports-modules-5.0.0-15-generic N/A
linux-firmware 1.178.1
Tags: disco
Uname: Linux 5.0.0-15-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 02/08/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.name: 0T8078
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A17
dmi.modalias: dmi:bvnDellInc.:bvrA17:bd02/08/2018:svnDellInc.:pnXPSL421X:pvrA17:rvnDellInc.:rn0T8078:rvrA00:cvnDellInc.:ct8:cvrA17:
dmi.product.family: 103C_5335KV
dmi.product.name: XPS L421X
dmi.product.sku: XPS L421X
dmi.product.version: A17
dmi.sys.vendor: Dell Inc.

See original description

Tags:

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-05-15:

Dependencies.txt Edit (40.3 KiB, text/plain; charset="utf-8")
ProcCpuinfoMinimal.txt Edit (1.0 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (115 bytes, text/plain; charset="utf-8")

Brian Murray (brian-murray) on 2019-05-15

affects:

ubuntu-meta (Ubuntu) → linux (Ubuntu)

Revision history for this message

Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote on 2019-05-15: Missing required logs.

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 1829095

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.

Changed in linux (Ubuntu):
status:	New → Incomplete

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-05-17: AlsaInfo.txt

AlsaInfo.txt Edit (34.4 KiB, text/plain)

apport information

tags:	added: apport-collected
description:	updated

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-05-17: CRDA.txt

CRDA.txt Edit (468 bytes, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: CurrentDmesg.txt

CurrentDmesg.txt Edit (65.5 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: IwConfig.txt

IwConfig.txt Edit (268 bytes, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: Lspci.txt

Lspci.txt Edit (12.8 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: Lsusb.txt

Lsusb.txt Edit (618 bytes, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: ProcCpuinfo.txt

ProcCpuinfo.txt Edit (4.2 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: ProcCpuinfoMinimal.txt

#10

ProcCpuinfoMinimal.txt Edit (1.0 KiB, text/plain)

apport information

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-05-17: ProcEnviron.txt

#11

ProcEnviron.txt Edit (115 bytes, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: ProcInterrupts.txt

#12

ProcInterrupts.txt Edit (3.2 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: ProcModules.txt

#13

ProcModules.txt Edit (6.4 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: PulseList.txt

#14

PulseList.txt Edit (21.8 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: RfKill.txt

#15

RfKill.txt Edit (174 bytes, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: UdevDb.txt

#16

UdevDb.txt Edit (171.8 KiB, text/plain)

apport information

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Chris Martin (chris-martin-cc) wrote on 2019-05-17: WifiSyslog.txt

#17

WifiSyslog.txt Edit (99.9 KiB, text/plain)

apport information

Changed in linux (Ubuntu):
status:	Incomplete → Confirmed

Revision history for this message

Kai-Heng Feng (kaihengfeng) wrote on 2019-05-17:

#18

Please attach output of `ls /sys/class/leds/dell::kbd_backlight`.

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-05-20:

#19

cmartin@cockatoo:~$ ls /sys/class/leds/dell::kbd_backlight
als_enabled brightness_hw_changed power subsystem
als_setting device start_triggers trigger
brightness max_brightness stop_timeout uevent

Revision history for this message

Kai-Heng Feng (kaihengfeng) wrote on 2019-06-25:

#20

Does backlight change when you change the "brightness" value?

# echo 0 > /sys/class/leds/dell::kbd_backlight/brightness
# echo 2 > /sys/class/leds/dell::kbd_backlight/brightness

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-06-25: Re: [Bug 1829095] Re: Keyborad backligt does not work

#21

Download full text (3.4 KiB)

No. I just tried again, as the kernel uas updated this morning.
For this model the max value is 2, and the min is 0.
I have tried all 3.

Cheers

----------------------------------------------------------
Chris Martin
m: +61 419 812 371
e: <email address hidden>
----------------------------------------------------------

On Tue, 25 Jun 2019 at 15:00, Kai-Heng Feng <email address hidden>
wrote:

> Does backlight change when you change the "brightness" value?
>
> # echo 0 > /sys/class/leds/dell::kbd_backlight/brightness
> # echo 2 > /sys/class/leds/dell::kbd_backlight/brightness
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1829095
>
> Title:
> Keyborad backligt does not work
>
> Status in linux package in Ubuntu:
> Confirmed
>
> Bug description:
> I have a dell XPS14 (L421X). In releases 18.04 and lower the keyboard
> back light used to work. However in 18.10 and 19.04 it does not
>
> The dell_laptop model is loaded.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 19.04
> Package: ubuntu-desktop 1.431
> ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
> Uname: Linux 5.0.0-15-generic x86_64
> NonfreeKernelModules: nvidia wl
> ApportVersion: 2.20.10-0ubuntu27
> Architecture: amd64
> CurrentDesktop: ubuntu:GNOME
> Date: Wed May 15 11:44:51 2019
> InstallationDate: Installed on 2019-04-23 (21 days ago)
> InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
> SourcePackage: ubuntu-meta
> UpgradeStatus: No upgrade log present (probably fresh install)
> ---
> ProblemType: Bug
> ApportVersion: 2.20.10-0ubuntu27
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: cmartin 2046 F.... pulseaudio
> CurrentDesktop: ubuntu:GNOME
> DistroRelease: Ubuntu 19.04
> InstallationDate: Installed on 2019-04-23 (23 days ago)
> InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
> MachineType: Dell Inc. XPS L421X
> NonfreeKernelModules: nvidia wl
> Package: linux (not installed)
> ProcFB: 0 inteldrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-15-generic
> root=UUID=994f28ca-26f0-46f9-9e20-27bb85872aa0 ro quiet splash vt.handoff=1
> ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
> RelatedPackageVersions:
> linux-restricted-modules-5.0.0-15-generic N/A
> linux-backports-modules-5.0.0-15-generic N/A
> linux-firmware 1.178.1
> Tags: disco
> Uname: Linux 5.0.0-15-generic x86_64
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
> _MarkForUpload: True
> dmi.bios.date: 02/08/2018
> dmi.bios.vendor: Dell Inc.
> dmi.bios.version: A17
> dmi.board.name: 0T8078
> dmi.board.vendor: Dell Inc.
> dmi.board.version: A00
> dmi.chassis.type: 8
> dmi.chassis.vendor: Dell Inc.
> dmi.chassis.version: A17
> dmi.modalias:
> dmi:bvnDellInc.:bvrA17:bd02/08/2018:svnDellInc.:pnXPSL421X:pvrA17:rvnDellInc.:rn0T8078:rvrA00:cvnDellInc.:ct8:cvrA17:
> dmi.product.family: 103C_5335KV
> dmi.p...

No.  I just tried again, as the kernel uas updated this morning.
For this model the max value is 2, and the min is 0.
I have tried all 3.

Cheers

----------------------------------------------------------
Chris Martin
m: +61 419 812 371
e: chris@martin.cc
----------------------------------------------------------

On Tue, 25 Jun 2019 at 15:00, Kai-Heng Feng <kai.heng.feng@canonical.com>
wrote:

> Does backlight change when you change the "brightness" value?
>
> # echo 0 > /sys/class/leds/dell::kbd_backlight/brightness
> # echo 2 > /sys/class/leds/dell::kbd_backlight/brightness
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1829095
>
> Title:
>   Keyborad backligt does not work
>
> Status in linux package in Ubuntu:
>   Confirmed
>
> Bug description:
>   I have a dell XPS14 (L421X).  In releases 18.04 and lower the keyboard
>   back light used to work.  However in 18.10 and 19.04 it does not
>
>   The dell_laptop model is loaded.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 19.04
>   Package: ubuntu-desktop 1.431
>   ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
>   Uname: Linux 5.0.0-15-generic x86_64
>   NonfreeKernelModules: nvidia wl
>   ApportVersion: 2.20.10-0ubuntu27
>   Architecture: amd64
>   CurrentDesktop: ubuntu:GNOME
>   Date: Wed May 15 11:44:51 2019
>   InstallationDate: Installed on 2019-04-23 (21 days ago)
>   InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
>   SourcePackage: ubuntu-meta
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   ---
>   ProblemType: Bug
>   ApportVersion: 2.20.10-0ubuntu27
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  cmartin    2046 F.... pulseaudio
>   CurrentDesktop: ubuntu:GNOME
>   DistroRelease: Ubuntu 19.04
>   InstallationDate: Installed on 2019-04-23 (23 days ago)
>   InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
>   MachineType: Dell Inc. XPS L421X
>   NonfreeKernelModules: nvidia wl
>   Package: linux (not installed)
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-15-generic
> root=UUID=994f28ca-26f0-46f9-9e20-27bb85872aa0 ro quiet splash vt.handoff=1
>   ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
>   RelatedPackageVersions:
>    linux-restricted-modules-5.0.0-15-generic N/A
>    linux-backports-modules-5.0.0-15-generic  N/A
>    linux-firmware                            1.178.1
>   Tags:  disco
>   Uname: Linux 5.0.0-15-generic x86_64
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
>   _MarkForUpload: True
>   dmi.bios.date: 02/08/2018
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A17
>   dmi.board.name: 0T8078
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 8
>   dmi.chassis.vendor: Dell Inc.
>   dmi.chassis.version: A17
>   dmi.modalias:
> dmi:bvnDellInc.:bvrA17:bd02/08/2018:svnDellInc.:pnXPSL421X:pvrA17:rvnDellInc.:rn0T8078:rvrA00:cvnDellInc.:ct8:cvrA17:
>   dmi.product.family: 103C_5335KV
>   dmi.product.name: XPS L421X
>   dmi.product.sku: XPS L421X
>   dmi.product.version: A17
>   dmi.sys.vendor: Dell Inc.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829095/+subscriptions
>

Revision history for this message

Kai-Heng Feng (kaihengfeng) wrote on 2019-06-25:

#22

Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2-rc6/

If latest mainline kernel doesn't work then we need to do a kernel bisection.

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-10-21:

#23

I was not able to install the kernel you requested as this is my main machine.
However Ubuntu 19.10 has been released and I have upgraded to it (in-place upgrade) and the keyboard backlight does not work on this kernel (5.3) either

Revision history for this message

Chris Martin (chris-martin-cc) wrote on 2019-10-21:

#24

PS. In the next month I will have moved my work from the laptop to a destop machine, freeing the laptop to load up various kernels as need ed

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Keyborad backligt does not work

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