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Using 2 AMD gpus to power 3 monitors, when I enable Xinerama and reboot Unity doesn't open.

I am using the 12.11 beta drivers from ATI and 12.10 version of Ubuntu.

Here is a log using the Unity --reset command.

http://pastie.org/pastes/5565331/text

The log mentions several files it can't find and ends with:

compiz (core) - Fatal: No composite extension

I've tried using KDE and Gnome Classic and Xinerama is working well there. However using Compwiz --reset in those Window Manager results in the same compiz (core) - Fatal: No composite extension error. So that can't be why Xinerama isn't working, right?

Any help here would be appreciated. Multi monitor support is crucial :(

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Xinerama will never work with Composite. Unfortuantly, you are out of luck until XRandR supports multi-GPU. –  user144788 Mar 27 '13 at 15:24
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