Some Display Managers No Longer Require ck-launch-session
Did ConsoleKit shutdown, reboot, suspend, and hibernate recently stop working for you? Unable to mount volumes that you were able to before? Chances are you’re probably using an alternative display manager (as opposed to KDM and GDM) and had to specify ck-launch-session to get things working correctly. Some display managers that have opted out of direct ConsoleKit support (usually in the name of being lightweight and/or simple) have started including direct support (my case: SLiM).
Just remove ck-launch-session from whichever line from whatever configuration file your display manager uses to begin launching an X session. In the case of SLiM, this is the login_cmd line in /etc/slim.conf.