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How to enable Hibernate in 12.04?

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linux-howto

http://askubuntu.com – I just installed the new 12.04 beta on my Lenovo Ideapad U450. According to this thread Whither hybrid suspend? hibernate and suspend are supported, but in the power settings the option to hibernate is greyed out e.g. for what to do when closing the lid. How can I enable it? My goal is, that if suspend to both is not supported a behaviour something like, suspend to ram and when battery is low, suspend to disk. Is this possible? /Kind regards Christian (HowTos)