I have a machine with an nVidia AGP graphics card, and a Linksys PCI wireless card in it. When I use the nv driver provided with X for the graphics card and ndiswrapper for the wireless card, everything goes smoothly and works great (in fact I'm posting wirelessly right now). However, I am now trying to run dual monitors, which works beautifully with twinview (using the nvidia driver), but as soon as I start using the nvidia driver instead of the nv driver (twinview enabled or not), wpa_supplicant can no longer authenticate with my AP and if I ping my wireless router, I get destination unreachable.

Running SuSE 9.1, kernel 2.6.4-52, ndiswrapper 0.10, wpa_supplicant 0.2.4. Graphics card is an nVidia FX5200 and wireless card is a Linksys WMP54G.

Anyone have any idea what might be going wrong? What should I check for?

Switched the wireless card into a different slot (farther from the GPU) and now it works awesome.

I don't think it was a matter of distance, it was probably an IRQ problem that was solved by putting it in a different slot.

Yeah, could well be. Whatever it was, that worked, so I'm happy. I even had my machine at school the last couple days and was able to connect there too pretty painlessly.