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Using unity 11.04. I have a secondary monitor (actually two, one at home, one at work). The home twin monitor set up works perfect (Viewsonic monitor). At work, I get very buggy behaviour, such as full screen applications 'ghosting' when maximized, and other strange effects. I would like to try and completely reset the monitor configurations (not unity or compiz), before doing anything else. In 10.10 this would be accomplished:

dpkg-reconfigure xserver-xorg
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This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) – Ringtail Feb 26 '12 at 5:28
We need more hardware information to help you, can you look at this question and then edit your question adding the information. – bodhi.zazen Feb 29 '12 at 19:16

If you think it's some user preferences settings, then you can create a new user "temp", login as a "temp" and see if it's ok.

You can also try xrandr --auto.

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It's xrandr --output <your output> --auto – chmike Jan 26 '13 at 12:58

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