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I think I have a common use case that is not properly handle by Lion.

If I close the lid and remove the power supply, my macbook is not going to sleep mode and stays awake draining the battery. It's like having the Caffeine active.

In fact, I do have Caffeine started but it is inactive.

This happens quite regularly, do you know a solution for this?

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Do you have any peripherals attached? –  Daniel Lawson Nov 5 '11 at 22:35
    
Not sure but I may had a phone charging over USB (iPhone or Android). Still I'm sure this should not be the cause because I discovered that the computer was still on after staying more than one hour in the backpack without any peripheral attached. –  sorin Nov 5 '11 at 23:22
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Does your screen stay bright because it might be your laptop's closing sensor (whatever it's called) broken. –  theAmateurProgrammer Nov 7 '11 at 9:24
    
Is has to be something else, the screen is dimmed and asks for the password after I open the lid. –  sorin Nov 7 '11 at 13:13
    
I have the same problem - worked flawlessly with Snow Leopard! –  user13417 Nov 8 '11 at 19:39
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