Hi, I did some progress (being xion.luhnis from fedora-fr). However, I'v stopped my work on the dsdt file during some time until next week for personal reasons (study examinations). I'll continue to try some fix as soon as I can. In my case, I'v succeeded in using both cards alone. (using winxp reboot to switch) I used different xorg configurations for each card and all worked out-of-the-box on Fedora 10. For the dsdt file, I compiled it with the whole kernel (and not only the initram), but it should also work. In fact, it won't make you switch working, but persisting. With the dsdt-hack, linux don't (or seems not to) uninitialize the switch at shutdown. Then you can work on some mode without need to go through winxp as long as you stay on the same mode. The problem is that you'll need some day to change and then you'll need to use winxp again. Note : in my case, I didn't tried to reflect the nvidia version, but I changed the _OS code of linux to reflect the one of windows xp sp2. Hoping we'll find some valuable solution to our problem. Have a good week-end. Alexandre Kaspar jtechs