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my thinkpad x201i has ubuntu 11.04 installed. i try to connect an external monitor(a HP LCD) to the laptop. it worked at first time, everything is fine. but when i connect the monitor the second time, laptop screen goes complete black and HP monitor flickers like crazy. any idea on how to fix it?

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my xorg.conf Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 75.0 VertRefresh 43.0 - 75.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" EndSection Section "Screen" Identifier "Default Screen" Device "Device0" Monitor "Monitor0" SubSection "Display" Modes "1280x800@60" "800x600@60" EndSubSection EndSection –  aztack Jul 5 '11 at 8:51

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