power button no longer shuts down

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http://forums.fedoraforum.org – I have a viao VGN-S460 that until recently the power button would trigger the shutdown prompt. As of a few kernel updates ago, it no longer seems to do anything. The power management preferences setting for the power button is still at "Ask me", but changing it to "Shutdown" or anything else seems to make no difference. What is the best way to start chasing down what is going wrong? Thanks! Marcus Hall (HowTos)