upgraded from 17.04 to 17.10 64-bit desktop. ASUS Transformer T300 CHI-
FL005H. kernel 4.13.0-32-generic and gnome-settings-daemon
3.26.2-0ubuntu0.1

syslog and journalctl spammed exactly as described - gdm3 and gsd-
backlight-helper --set-brightness

I can confirm "systemctl stop iio-sensor-proxy" causes these messages to
stop, but less frequent errors from org.gnome.Shell.desktop are logged
repeatedly, e.g.

Error.checkin_request.cc(211) failed to get checking response. Fetcher
failed. Retrying.

Followed by various other org.gnome.Shell.desktop messages. I can
provide a log if they might be useful, but I suspect they are triggered
by killing the iio-sensor-proxy and so are probably not very relevant to
the original bug.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-settings-daemon in Ubuntu.
https://bugs.launchpad.net/bugs/1584457

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

Status in GNOME Settings Daemon:
  Fix Released
Status in gnome-settings-daemon package in Ubuntu:
  Fix Released
Status in gnome-settings-daemon source package in Xenial:
  Confirmed

Bug description:
  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?

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