My Powerbook 12" doesn't wake when I plug AC power

I always use my powerbook with lid closed when I am at home.
The issue is, as title described, when I plug AC power in,
my powerbook doesn't wake immediatly!
It used to, but now it's not!
The wakeup options in system preferences are only about wake on a modem ring or signal from ethernet, not about the AC power.
How can I turn this feature on?
Thanks!
Powerbook G4 12 1.33G Mac OS X (10.4.6)

The command "pmset" could solve this.
Type "man pmset" in terminal for usage of command pmset.

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My Powerbook 12" doesn't wake when I plug AC power

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