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After my laptop goes into standby is there any way to put it into hibernate when the battery reaches a critical level?

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It's built into my Sony Vaio software. Are you sure you don't have a similar utility on your PC? –  BrianA Nov 27 '10 at 12:11
    
Windows can make it hibernate after being alseep for a certain amount of time. –  paradroid Nov 27 '10 at 15:34

1 Answer 1

You probably want “hybrid suspend”, also called “hybrid sleep” or “suspend to both”. See a Linux discussion, Windows discussion.

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That's not suitable for laptops and it's usually disabled on laptops by default, as it would make the laptop write a complete hibernation memory dump every time it goes to sleep, therefore using much more battery power than standard sleep. –  paradroid Nov 27 '10 at 15:33
    
@jason404: Why would it be unsuitable for laptops? If you want to minimize battery consumption, you need to suspend to disk only unless it's only for a few minutes, as RAM power consumption is non-negligible. The point of suspend to both is to be able to resume quickly. –  Gilles Nov 27 '10 at 15:51
    
Have you actually tried using hybrid sleep/suspend-to-both on a laptop? It's not practical, as everytime you close the lid it will save the complete RAM state, which takes some time when you have a lot of RAM and also uses more power, as every time your laptop goes to sleep after not being used for a little while, it will go through the whole process. This ends up using a lot more battery power than you would have used when just using Sleep mode instead. –  paradroid Nov 27 '10 at 16:17
    
Also, the benefit of Hybrid sleep over normal Sleep on desktop PCs is that it is robust against power outages, which is not relevant on laptops, as they effectively have built-in UPSs. –  paradroid Nov 27 '10 at 16:17

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