Da hilft wohl nur warten...Zitat aus den release notes:
3.5. Multi-head
Some multi-head configurations are supported in this release, primarily with multiple PCI/AGP cards. However, this is an area that is still being worked
on, and we expect that the range of configurations for which it works well will increase in future releases. A configuration that is known to work well in
most cases is multiple (supported) Matrox cards.
One of the main problems is with drivers not sufficiently initialising cards that were not initialised at boot time. This has been improved somewhat with
the INT10 support that is used by most drivers (which allows secondary card to be "soft-booted", but in some cases there are other issues that still
need to be resolved. Some combinations can be made to work better by changing which card is the primary card (either by using a different PCI slot,
or by changing the system BIOS's preference for the primary card).
j. - www.obira.de