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Yeah, keep it on all the time or just have it suspend.

That way you can 'turn it on' (ie wake it up) from mouse movement/keyboard use.
 
Yeah, mine almost never sleeps in closed mode. It always wakes up when I close it, and then is burning like hell when I open it again.
 
No, make it 'sleep' after x minutes of inactivity. Its not about if the lid is closed or not.
 
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