Description of problem: I upgraded from F16 to F17 (preupgrade) to F18 (yum). In F16, I had the action for laptop lid close to (blank). However, after the update to F18, the laptop suspends when the lid is closed. I confirmed using dconf-editor the default action for org.gnome.settings-daemon.plugins.power has lid-close-ac-action and lid-close-battery-action set to blank. I changed both to 'nothing', but still the laptop suspends on lid close. Laptop should not suspend on lid close if it's disabled via the settings editor.
I can confirm this problem with gnome-settings-daemon-3.6.3-2.fc18.x86_64 systemd-195-13.fc18.x86_64 Laptop always suspends on lid close, regardless of dconf policy.
Unfortunately, this option is gone now. See bug 872091 for more info.
*** This bug has been marked as a duplicate of bug 872091 ***