Eu não acho que exista uma maneira sem aplicativos de terceiros. InsomniaX 2.0 que permitirá que você controle o comportamento da tampa.
InsomniaX disables the sleep mode on a Apple Laptop allowing you to play music through speakers while it's closed. Also adds the option to enable hibernation mode. We are currently looking for a new icon set for InsomniaX, if anyone can produce a new "lickable" set please contact the help desk