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I have a HP dv4-2040br and upgraded from Ubuntu 12.04 to 13.04 and the laptop screen stopped working. I got back to the 12.04 and it came back and when I reinstalled the 13.04 it stopped again. An external monitor is working. How can I fix it?

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Which graphic card drivers are you using? –  Leo Jun 9 '13 at 20:39
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