Even though I have 'hibernate' selected for 'on battery, press power button', all that happens when I do is the screen saver activates. /var/log/acpid doesn't get updated running 'sudo pm-hibernate' by hand from konsole works fine. Reproducible: Always Steps to Reproduce: have 'hibernate' selected for 'on battery, press power button', Actual Results: all that happens when I do is the screen saver activates. Expected Results: hibernation Ubuntu 12.04 beta
This was https://bugs.launchpad.net/ubuntu/+source/policykit-desktop-privileges/+bug/812394 which was some crazy decision Ubuntu made to turn off hibernate in some weird way.