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I had this same problem with my previous x50v. I posted this question at many forums but no one could give me the answer. So at the end, I called up the Dell Support Centre, they told me this was a known problem, and they immediately gave me a new replacement of the x50v.
I understand how it felt like. No matter how hard u tried, whether changing the registry, or even updating the ROM to the latest, the problem just persisted.
Now with my new replacement unit, the problem is gone. Thank goodness Dell is very good at its aftersales support (in fact my warranty has already expired when I called them up about this issue... couldn't imagine how i could live with such annoying display problem for more than a year!).
So, quickly --- call Dell up, and get it changed immediately!
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