[ubuntu] laptop and external monitor keyboard problem

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http://ubuntuforums.org – I have a dell Inspiron 1521 laptop and once in a while I need to plug it in my 32" TV/Monitor. Everything works fine until I need to type some key on the laptop keybaord. When I touch any key the display drop from the external monitor and switchs to the LCD on the laptop. The only way around this is to use a remote keyboard and then it does not switch. Maybe the question I should be asking is, is there a setting somewhere to stop this? Am I missing something somewhere? I don't ever remember having this problem before. It does it in 11.10 and 12.04 beta. (Hardware)