I have the same problem on an apple iBook G4. 
Sometimes it does work though, but at other times just nothing happens. 
When I run lshal -m, and press the power button I do get this event:

21:50:11.063: computer_logicaldev_input_0 condition ButtonPressed =
power

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nothing happens when the power button is pressed on ThinkPad X61
https://bugs.launchpad.net/bugs/175238
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