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I have a Lenovo thinkpad T530 with Ubuntu 12.10 installed. When I connect an external monitor (Acer 23') to my laptop it works fine, but both screens flicker periodically and gets reset. The applications opened in the external monitor moves to the laptop screen when reset. Is this a problem with the graphics card driver? Is there a solution for this problem? Thanks

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Does this also occur on Windows? Ever tried changing screen/cable? – panmari Feb 16 '13 at 15:35
Changed the cable and it works ok. Thanks. – Jeewantha Feb 26 '13 at 7:36

Try updating your BIOS. There is a BIOS update for some of these models that include: Fixed an issue that might have screen corruption on Linux.

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