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I have two monitors and a ATI Radeon 5750 video adapter.
Using ATI's catalyst control center I am able to configure the displays so that the desktop spans over the two monitors.

The multi-desktop settings are preserved when logging with KDE. It was also working properly with gnome and unity (when i used to have them installed).

BUT: when logging in with XFCE the second monitor is cloning the first (instead of creating an extended desktop).

I can enter into ATI's control center and reconfigure the desktop. But the settings are lost when i logoff !

Does anyone have any clue about what is happening here ? Why does the Xfce desktop uses some wrong multi-monitor settings ?

This problem appeared first when i upgraded to 11.10 (about 2 months ago). And now after upgrading to 12.04 the problem persists.

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marked as duplicate by Chris Wilson, Mik, stephenmyall, Eric Carvalho, Uri Herrera Mar 6 '13 at 0:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Follow instructions here to update to Xfce 4.12., which will provide a new minimal display settings window, and options for dual monitor, which were not present in Xfce display manager in older versions.

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