Although only one user (user1) logged once in F-17 (x86_64 up to date), executing poweroff defaults to the "Authentication is required for powering off the system while other users are logged in" snippet.
Results from who and users follows:
# who
user1 :0 2012-07-23 13:04 (:0)
user1 pts/0 2012-07-23 14:39 (:0)
root pts/1 2012-07-23 14:39 (:0)
root pts/2 2012-07-23 14:39 (:0)
root pts/3 2012-07-23 14:39 (:0)
root pts/4 2012-07-23 14:39 (:0)
# users
ml ml root root root root
Is this correct or is it there is a problem?
Thanks in advance.