I have recently upgraded my ThinkPad T500’s operating system to Ubuntu 12.10 and everything went very smooth except an annoying issue: the suspend functionality was not activated when I closed the laptop lid. Running pm-suspend from the command line, clicking on the Suspend from the GUI, or using the Fn+F4 key combination was working and my laptop was going into the sleep mode but somehow closing the lid was not achieving the same effect.
A quick Google search turned this bug report: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/863834 and a simple work around: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/863834/comments/30
So I have decided to implement a similar workaround, but instead of using pm-suspend, I preferred to use dbus-send to invoke the sleep mode (see http://ubuntuforums.org/showpost.php?p=11331634&postcount=6 for more details):
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