[ubuntu] Timer to change state from suspend to hibernate ??

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http://ubuntuforums.org – Hi there, I have an MSI WInd u100 with Ubuntu 9.04 jaunty on it. Laptopmode is enabled and it can Suspend/Hibernate and Resume without any problem. I was wondering if there is a way I can get the laptop to go from Suspend state to Hibernate after a given period of time. This already happen on critical battery condition but I would like to set a timer based switch so, for instance, if I leave the laptop on Suspend it switches to Hibernate after 15 min . I have read the laptop-mode.config man , but I do not seem to see anything that can help neither google gives anything interesting. Is it something feasible ? Any idea on how to? Thanks Palmer (Hardware)