secure log filling up with identical messages

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http://forums.fedoraforum.org – I just noticed that /var/log/secure is 100Meg in size for the week and is filled with almost nothing but the following: Aug 23 15:41:57 billlaptop pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Aug 23 15:41:57 billlaptop pkexec[2294]: bill: Executing command [USER=root] [TTY=unknown] [CWD=/home/bill] [COMMAND=/usr/libexec/gsd-backlight-helper --set-brightness 0] There are several of these per second. Some days it goes on all day long. Other days it seems to quit a few minutes after I boot the machine and login for the first time as a non root user (bill). (HowTos)