GTX460 + GTX275 + Xinerama causes repeated X crashes
I have a three screen setup using two graphics cards - a GTX460 and a GTX275. I can setup xorg to run the three screens as separate X servers, but whenever I try to enable xinerama, X restarts indefinitely (it shows the nvidia logo, then goes black, waits a few seconds and starts again).
If I just try to use the two screens on the GTX460 with xinerama that works fine.
I previously had GTX275 + 8500GT setup and that also ran xinerama fine on the same drivers, so I suspect it's something to do with the combination of a fermi and non-fermi card when using xinerama.
I originally had the problem in 256.44, and the problem still exists in 256.52. I'm using Ubuntu 10.04 with X Org 1.7.6.