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Below are side-to-side screen shots of virtual screen0 (left-hand side) and virtual screen1 (right-hand side)...
Notice spanned wallpaper is repeating for virtual screen0 and virtual screen1.
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* When enabling xinerama (i.e. In "Server Layout: '''Option "Xinerama" "1"''' ), screen 1 is mirrored, and does not allow mouse pointer to move to other card (although other card's monitors span correctly. Background picture shows in screen 1, but only background colour displays in screen 0).
* '''Radeon error''' upon boot-up: '''error during ACPI method call'''
* I seem to have better luck when setting Nvidia card to older driver such as "nv" as opposed to "radeon". Unfortunately, also seem to lose better graphics capabilities...
Additional information from '''grep radeon /var/log/messages''':