I've been searching for a solution for an M75P 9979 A1U as well, except I need three monitors working. I've installed an Asus Radeon EAH3450 PCIe card and can get dual video with it (system defaulted to pcie card as soon as I installed it). I've tried changing the setting in the bios to onboard (IGD), but it disables the pcie card (doesn't even show up on device manager, infact nothing shows up under display adapters). Setting the bios to pcie (PEG) disables the onboard (again, the onboard doesn't show up on device manager). I'm pretty well versed with computer systems so if I have to change some jumper settings on the mobo or flash the bios, its not a problem.
If anyone is looking for just dual-monitor, the EAH3450 (512mb pcie) goes for about $65-70 CAD and works fine, has 1 vga and 1 dvi port, plus a dvi-to-vga adapter).
