same problem here, system freezes randomly, can't be pinged anymore, no ssh 
possible, needs hard reset.
no entry in system logs.
First problems after updating from lucid. Also a clean install didn't help. 
Occurs randomly, doesn't depend on any action or specific program running.   
Never happens when power supply is plugged in.
System: FSC Lifebook S6420, Chipset Intel 45GM, Graphics Intel GMA X4500

-> So this is definitely NOT a problem with ATI-drivers (also see
comments with nvidia graphics)!

-- 
System freezes when running on battery
https://bugs.launchpad.net/bugs/662998
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