app for display control

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http://forum.xda-developers.com – Does anyone know of an app that can activate and deactivate the screen when it the charger is plugged in. I know the Nexus 7 already wakes when you plug the charger in, but i would like to be able to have the screen turn off when the charger is unplugged. I am mounting the tablet in my vehicle in such a way that the power button is inaccessible and the tablet is going to live in the car. I am hoping this is possible with an app because if it is not, my other course of action is much more complicated. Any help you guys can give would be much appreciated. (HowTos)