Public bug reported:

Since updating to 16.04 from 14.04, I have the syslog spammed by:

SEC: May 22 13:26:43 samsung-romano pkexec[21248]: 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 
1766]
SEC: May 22 13:26:43 samsung-romano pkexec: pam_unix(polkit-1:session): session 
opened for user root by (uid=1153)
SEC: May 22 13:26:43 samsung-romano pkexec: pam_systemd(polkit-1:session): 
Cannot create session: Already running in a session
SEC: May 22 13:26:43 samsung-romano pkexec: pam_ck_connector(polkit-1:session): 
cannot determine display-device
SEC: May 22 13:26:43 samsung-romano pkexec[21249]: romano: Executing command 
[USER=root] [TTY=unknown] [CWD=/home/romano] 
[COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 
4322]
SYS: May 22 13:26:43 samsung-romano gnome-session[1454]: Error executing 
command as another user: Not authorized
SYS: May 22 13:26:43 samsung-romano gnome-session[1454]: This incident has been 
reported.

every couple of seconds or so. There is no really need to change
brightness... how can I stop it?

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gnome-settings-daemon

** Tags added: gnome-settings-daemon

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https://bugs.launchpad.net/bugs/1584457

Title:
  gsd-backlight-helper spamming the logs since upate to 16.04

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