Ok. Please try disable NTP time synchronizing, or just disconnect your pc from internet. Then try to hibernate your computer, maybe your problem with screenlocking disappear.
Can you 'strace' any application that can be runned after hibernating? https://wiki.ubuntu.com/Strace -- Can't start programs after resume from suspend/hibernate https://launchpad.net/bugs/52200 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
