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When i unplug my battery charger my screen turns black. I already checked the brightness/battery settings, but nothings is wrong with those settings. Someone have any idea how to solve this problem?

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*using ubuntu 13.04 –  user186380 Aug 22 '13 at 18:08
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Can you add your laptop model to your question? Thanks! –  Jorge Castro Aug 22 '13 at 18:12
    
my laptop model is asus k52j –  user186380 Aug 22 '13 at 18:28
    
I also have it with ubuntu 12.04 –  user186380 Aug 22 '13 at 18:58
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