[kubuntu] changing the screenresolution on secondary display

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http://ubuntuforums.org – hello all, i have a problem with ubuntu 9.10 on my thinkpad r61 lenovo laptop. the screen resolution on the secondary monitor seems to be always the same as on the laptop display, even when the laptop display is turned off. choosing a differnt higher resolution, the desktop seems like to be expanded beyond the borders of my secondary monitor instead of been fitted onto the monitor. it seems like the current resolution stays the same and simply the size of the desktop is been expaned. i have searched this forum and have have found nothing to answer this. can some (Hardware)