Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gdm gnome-settings-daemon pkexec

** Attachment added: "Ubuntu 4.13.0-16.19-lowlatency 4.13.4"
   
https://bugs.launchpad.net/bugs/1726684/+attachment/4990060/+files/version.log

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https://bugs.launchpad.net/bugs/1726684

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

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