Thank you, but the problem is not to enable hibernating in the GUI. I already have got the "hibernate" button in the logout dialogue. The problem is that the hibernating process itself is broken since the update. A
worked correctly under 13.10. Now it "hibernates down" the laptop, but it does not wake up correctly any more. I have no idea how to debug the problem.
$ sudo pm-hibernate
What I mean is this:
Nevertheless, a pm-hibernate fails since the update.
$ if pm-is-supported --hibernate; then echo "SUPPORTED"; fi