[ubuntu] External monitor problems with laptop

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http://ubuntuforums.org – I have a Dell Precision M6500 laptop with 2 x 24" dell monitors connected via a docking station. Graphics card is NVIDIA Quadro FX2800M. Everything has been ok (except for manually setting the displays in NVIDIA X-server Settings) when running ubuntu 10.10, but when I upgraded to 11.10 I can't get the external monitors to work. The NVIDIA X settings hangs when i try to enable the 2nd external display, and the only way to reset is to do a restart of the computer. It somehow works for only one display, but it changed the desktop settings. I have found some posts about the same prob (Hardware)