Sometimes the brigthness is going down

I don't know what happening... Sometimes the brigthness display is going down. I have to go to the system preferences/display and put the brigthness up.
Is it normal?
PowerBook G4   Mac OS X (10.4.3)  

Tiger also has an Energy Saver option that will automatically reduce the brightness of the built-in display when you switch power sources (A/C adapter to battery). It can dim the display when you go to battery to use less juice.
You can also toggle this option off and on in the Engery Saver System Pref Pane.

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