[ubuntu] Complete hangup when switching to external Monitor after Hibernation

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http://ubuntuforums.org – Usually I can change between monitors with Fn+F8 without problems. Only when I put the computer into hibernation, bring it back and then try to activate the external mnitoor I get a 100% freeze and need to hard reset. When I press Fn+F8 then, the monitor activates, both screens turn black with only the mousepointer on them. On the laptop LCD the mousepointer is then frozen to the center of the right edge of the screen and on the monitor its frozen to the very center. Any idea? PS: The graphics set is Intel GMA950 (Hardware)