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In a macbook pro, with OSX Snow Leopard, I use hibernation thanks to the widget "deep sleep". But when it wakes up, the screen is fully white, lots of lights. I wonder if it can be somehow modified to be completely black, so while I am at a conference, people do not notice it

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Have you considered setting the brightness to 0 before you put it to sleep? –  slhck Jun 8 '11 at 14:28
no, but I will have a look at that! –  flow Jun 8 '11 at 15:41

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