Error for gdm executing gsd-backlight-helper --set-brightness

[Danny]

journalctl -f

pkexec[11203]: gdm: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/var/lib/gdm3] [COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 155]

lsb_release -a
LSB Version: core-9.20160110ubuntu5-amd64:core-9.20160110ubuntu5-noarch:security-9.20160110ubuntu5-amd64:security-9.20160110ubuntu5-noarch
Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful
---
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: hdzhong 3573 F.... pulseaudio
 /dev/snd/controlC1: hdzhong 3573 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 17.10
HibernationDevice: RESUME=UUID=cddb6340-5d33-4544-9dd1-2082abe73463
InstallationDate: Installed on 2014-05-02 (1272 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 20CDS00600
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-lowlatency root=UUID=dcc341ae-1338-4d98-ab7e-89eebf8e35fc ro cgroup_enable=memory swapaccount=1 quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.13.0-16.19-lowlatency 4.13.4
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-16-lowlatency N/A
 linux-backports-modules-4.13.0-16-lowlatency N/A
 linux-firmware 1.169
Tags: wayland-session artful wayland-session
Uname: Linux 4.13.0-16-lowlatency x86_64
UnreportableReason: The report belongs to a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo www-data
_MarkForUpload: False
dmi.bios.date: 09/23/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: GQET47WW (1.27 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CDS00600
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50518 Std
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGQET47WW(1.27):bd09/23/2015:svnLENOVO:pn20CDS00600:pvrThinkPadS1Yoga:rvnLENOVO:rn20CDS00600:rvrSDK0E50518Std:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad S1 Yoga
dmi.product.name: 20CDS00600
dmi.product.version: ThinkPad S1 Yoga
dmi.sys.vendor: LENOVO

[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 1726684

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 v4.14 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/v4.14-rc6

[Danny (lesarde)]

apport information

[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

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[Danny (lesarde)]

I will try to test: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc6.

[Danny (lesarde)]

I have test tha mainline kernel: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc6.

The issue still exist.

uname -a
Linux Danny-Yoga 4.14.0-041400rc6-lowlatency #201710230731 SMP PREEMPT Mon Oct 23 11:36:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

uname -a
Linux Danny-Yoga 4.14.0-041400rc6-generic #201710230731 SMP Mon Oct 23 11:32:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -a
LSB Version: core-9.20160110ubuntu5-amd64:core-9.20160110ubuntu5-noarch:security-9.20160110ubuntu5-amd64:security-9.20160110ubuntu5-noarch
Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

that's rather a gnome-settings-daemon issue similar to https://bugzilla.gnome.org/show_bug.cgi?id=773685