Can Ubuntu be setup to work with videocards of different vendors at the same time for multiple monitor setup? (For example, ATI and Nvidia.) One is PCI and the other is PCIe. I've been able to get one or the other working but not both at the same time. Also with the Nvidia card I don't have the option to rotate the monitor/desktop layout as I can with the ATI card. Any advice on how to get these working?