Brightness setting missing in Preferences

The brightness adjustment is missing from my System Preferences. I cannot adjust the brightness from my keyboard or from the side of my Apple 24" monitor. The screen is stuck at a darker setting that is useful. Is there a way to fix this?

I had read in a few places to go to System Preferences/Display to adjust Brightness. Since my monitor would not respond to the Brightness adjustment buttons and my keyboard controls just beeped at me, I figured the control missing in System Preferences meant something was wrong on the OS level.
Further research revealed other users having similar problems on MacBooks. I also found some who had Brightness problems with Tiger. One person suggested opening Classic (OS 9). I did it and the Brightness controls did work. A clunky way to fix the problem, but apparently Apple has put off fixing it for some time in Tiger. It'll have to do until I upgrade to a new computer and not be using Tiger anymore (I fear problems if I try to upgrade my PowerMac to Leopard... I hear too many horror stories).

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Brightness setting missing in Preferences

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