On request, here's the output of ck-list-sessions:
Session2:
unix-user = '1114'
realname = 'Dan Engholm'
seat = 'Seat4'
session-type = ''
active = FALSE
x11-display = ':0'
x11-display-device = '/dev/tty7'
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2010-02-24T16:29:40.219433Z'
login-session-id = ''
--
PolicyKit: "Not Authorized to make changes"
https://bugs.launchpad.net/bugs/485586
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