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In Snow Leopard, whenever you close the lid of a MacBook, it puts it into sleep mode. Simple as that.

In Lion, it only puts it into sleep mode if it's running on it's battery. If it's plugged in it stays awake.

Does anybody know how I can get MacBook to start sleeping when I close the lid, regardless of charging state again?

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My early-2011 MBP 15" running Lion does go to sleep when I close the lid, whether it's on power or battery. perhaps you can supply more details of your scenario so that folks can help figure out why it's not working for you? –  David Aug 16 '11 at 22:01
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That's a great question, but I would consider editing the title before a moderator does it for you :) It's funny, but it does't help people search for similar problems ;) –  stuffe Aug 16 '11 at 22:03
    
@David I have a late 2010 13" MacBook Pro. Did you buy yours with Lion on it? –  tylermwashburn Aug 16 '11 at 22:16
    
No, my MBP was upgraded from Snow Leopard. –  David Aug 16 '11 at 22:19
    
@David Weird. I thought that might of been my problem, but I guess not. :\ –  tylermwashburn Aug 16 '11 at 22:25
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Ok guys, I figured it out.

I don't really know what is going on underneath, but it has something to do with having "Internet Sharing" enabled. Just disable it when you're not using it and your MacBook should now go into sleep mode when the lid is closed, even when it's plugged in.

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When the lid is closed, the Mac would always begin to try to sleep, I should think. However, if there are external devices connected, these may wake/prevent the sleep; external display, USB devices, etc.

To confirm this, open Console.app and see the logs around the time of the lid closing. If something is preventing the sleep, it will be reported.

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