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[ubuntu] Display pixilates when external monitor is attached (Natty Narwhal)

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http://ubuntuforums.org – Just upgraded to 11.04 and loving it. :D However, when I boot the acer aspire 5100 laptop with external VGA monitor plugged in, or when I attach it after boot, both screens pixilate and I can't see a thing. Unplugging the monitor doesn't help and I have to reboot. It works perfectly if the external monitor is never attached Happens regardless of gnome or unity used. Maybe a driver thing? Worked perfectly in 10.10 Any help would be much appreciated! I'm using: Acer Aspire 5100 ATI radion xpress 200m graphics External monitor connected by VGA. (Hardware)