Won't Hibernate when Battery Critical

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http://askubuntu.com – Ubuntu 12.04 64bit refuses to hibernate when battery is critically low. Instead it does a complete shutdown which is unnecessary and can cause loss of data. I have enabled Hibernate (pm-hibernate) on following the common instructions I tested pm-hibernate it is works fine when run manually. I have set my power options to hibernate "When Power is Critically Low". This has also been verified by using dconf Editor. Under org > gnome > settings-daemon > plugins > power > critical-battery-action it is set to "hibernate". Under the same schema, time-action is set to "120". I would like to see (HowTos)