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It might not be a linux problem, but a question of your BIOS and its settings for choosing and controlling the graphics as they are presented to the operating system. Unless you are willing to change BIOS settings each time you switch from Windows to linux or back, you need the BIOS to offer both graphic cards in some form at the same time, something it may well not do.
If you are willing to change graphic card settings back and forth in the BIOS, there is but one card present at boot at a time, and each operating system has in effect its own card.
On the other hand, if you set the BIOS so that the AGP card is configured in the BIOS, and put the PCI card in place, then booted a linux live-cd, you might just see if the PCI card, having its own IRQ, showed up as a choice when you started the process to reconfigure a graphics card in that live-cd linux installation.
If the Nvidia card were found along with the ATI, it might be possible to install linux and thereafter configure it for the Nvidia PCI card. Then, when the system boots, it would use the ATI card, but as linux boots, linux should choose the PCI card and load a module/driver for it, ignoring the ATI.
You might try an openSUSE 11.1 live-cd. It has good detection and a GUI for graphics and monitor configuration, but the new Ubuntu might serve as well.
This might even work; on paper it seems worth a try. Good Luck
Last edited by thorkelljarl; 04-27-2009 at 10:54 PM.
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