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I think there is a bug with the control panel. Please check Automatic Switching under Battery. Then uncheck Automatic Switching under Power Adapter. If you go back to Battery, you will find that Automatic switching is unchecked automatically. I think that the option for Automatic Switching under Battery and Power Adapter should be independent.

IC... I'm pretty sure Apple is working on it~

PS: NOT TO WORRY :D
 
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