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I'm using thinkpad T420s and kernel from rawhide. Suspend worked in kernel-3.2.0-0.rc1.git2.2.fc17.x86_64. Have no idea why it stopped working dmesg doesn't show any details actually there is nothing related to suspend in dmesg. I'm trying to suspend with pm-suspend and hibernate with pm-hibernate.
Sorry guys this is bug in /usr/lib64/pm-utils/sleep.d/56atd shell script