How do you prevent screen from dimming while on power adapter?

I don't want the screen to dim while I'm connected to the power adapter. In the Energy Saver module, it is optimized for better performance, which sets the following parameters:
-set to sleep when inactive (never)
-put the display to sleep when computer inactive for 30 minutes
Nevertheless, after periods of inactivity, the screen will dim (not sleep). I can't seem to stop it from doing so. Any suggestions?
YoungTurk

There are two things that will dim the screen - the Energy Saver and the Ambient Light Sensor.
In the Enerygy Saver panel select "Options" and then there is a check box that you need to uncheck. Since it is one the Options screen you may have missed it.
With respect to the Ambient Light Sensor, I think it should remember your settings once you set a brightness.

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How do you prevent screen from dimming while on power adapter?

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