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EDIT: the setup which it stays at is the last one, Multi-display desktop with display(s) 2.

This is the problem: with an ATI videocard, I set up dual monitor with the driver's own program. However, for some reason, the top ~200px isn't displayed and at the down ~200px there is only a black line, but only for one monitor. Also, somehow, even after applying, the setup does not change anything (even after restart). How can this be solved?

Update: when it is set to both monitors display the same, there is no black line, but when it is set to different, there is. And it still seems that applying does not work fine.

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closed as too localized by Eric Carvalho, Basharat Sialvi, Mateo, Thomas W., Kevin Bowen Apr 4 '13 at 2:53

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are the monitors with the same resolution? maybe you can try with dispel see the answer of this question. askubuntu.com/questions/82601/… –  maniat1k Feb 18 '12 at 17:24
Doesn't seem working fine for me: if I try NOT to clone then I get error message "required virtual size does not fit available size" –  axiomer Feb 18 '12 at 17:44
I couldn't get multi-monitor working right without xinerama on ATI –  hbdgaf Feb 28 '12 at 1:03
I can't change the setting, see the edit. It always stays Multi-display desktop with display(s) 2. –  axiomer Feb 29 '12 at 7:21
First please set Your both monitors resolution to very low: lets say 800x600 and see if that helps. If not: did You consider using drivers from ubuntu repos? –  Misery Feb 29 '12 at 8:44