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I am using a macbook pro running OSX 10.6 snow leopard.

In System Preferences/Displays/Display, I can change the brightness of the macbook's screen. However, this option is not available for the external monitor.

Is there a way to change the brightness of an external monitor without resorting to changing the settings manually on the monitor itself ?

This happens using both of the mini-displayports adapters (DVI & VGA)

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2 Answers

up vote 1 down vote accepted

You cannot do this from System Preferences because the video adapters do not have an interface into the brightness controls of the external monitor.

Sorry, but adjusting manually on the monitor is the only way.

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Try the preference pane Shades

There is also Dark Adapted, which will change many more aspects of each screen independently, but it is not longer supported (though it works with lion)

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Works great! This should be the reaccepted answer. –  Gerald Kaszuba May 15 '12 at 7:55
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