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It is rare when I use my MBP on battery power. But is there a way to only enable automatic graphics switching when on battery power?

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Take a look at can i force gpu rendering on my mbp when connected to a power source. Its similar (but not the same) so might help –  binarybob Mar 12 '12 at 8:37

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You can try an application called "gfxCardStatus" :)

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

"is there a way to only enable automatic graphics switching when on battery power?"

Yes.

Go to System Preferences -> Energy Saver There are two tabs at the top of the window; one for battery and one for AC power.

Set the graphics switching option by checking or un-checking "Automatic Graphics Switching" in those tabs.

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