Description of problem: In GNOME 3.26.2, I get the following errors in my system log repeatedly. Sender gsd-power Message Error executing command as another user: Not authorized Priority 4 This incident has been reported. Sender pkexec Message gdm: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/var/lib/gdm] [COMMAND=/usr/libexec/gsd-backlight-helper --set-brightness 384] Priority 4
*** This bug has been marked as a duplicate of bug 1322588 ***