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I am using dual monitor but after update to 13.10 my laptop's screen doesn't turn on it's always black, but the second monitor -the external one- is working properly. When I checked display setting I can see two monitors without any problem, they are detected.I also upgraded to Ati driver to 13.11 Beta to fix and I also switched my display server to Mir , but all of these couldn't helped me to fix problem.

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