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Temporarily prevent screen dimming System
If you are running your laptop on the battery, and want to temporarily prevent the screen from dimming after a short period of inactivity, you can use the 'Disable Screensaver' hot corner (set in the Desktop & Screen Saver System Preferences panel) to also prevent the screen from dimming.

In my tests, the screen would dim after 60 seconds of inactivity when display sleep was set to five minutes.

You can also permanently turn off screen dimming by opening the Energy Saver System Preferences panel. Select Settings for Battery, click the Options tab, and uncheck 'Automatically reduce the brightness of the display before display sleep.'
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Temporarily prevent screen dimming
Authored by: MAW on May 08, '09 08:48:20AM

I tried the settings as described, but the screen keeps dimming. My settings are as follows. I activated the Disable screen saver in the hot corner, upper right. In the battery mode the slider is set to put the display to sleep after 2 minutes. The scree saver is set to start the screen saver in 10 minutes. The display dims after about two minutes regardless. Is there a setting I am missing.

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