Fedora 18 suspends again on first resume

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http://forums.fedoraforum.org – This is not 100% reproducible, but occurs at least half the time. I am using Fedora 18 on my laptop (HP EliteBook 2540p) with the MATE window manager. After installing lightdm to replace gdm, I can set my laptop to suspend when the lid is closed. However, when I resume by opening it and pressing the power button, it often wakes only briefly (a few seconds) and then suspends again. On the second resume all is OK again. Any ideas? Is it possible there are two separate mechanisms trying to handle the suspend, so that the slower one completes only after the faster one has suspended the mach (HowTos)