Linux - SecurityThis forum is for all security related questions.
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Essentially, all encryption is vulnerable to such a cold boot attack. That being said, if your data is that important, your armed guards, security systems, and other multiple levels of physical security should be able to ensure that nobody is able to get access needed to exploit such a vulnerability.
I think the best you can do in that case is implement a shutdown script that overwrites your memory (there was one posted here in Security a while back, look for it). With that, at least you'll know you're okay if you do a proper shutdown. You'd still be vulnerable if someone gets their hands on your laptop while it's turned on, though.