Well, unless you use Alex's mergedfb in DRI CVS, then Xinerama will work w/ DRI, no? But even so, even my Windows Radeon drivers don't work well w/ dual head and 3D. I typically turn off the 2nd head before starting a 3D fullscreen app. Likewise, its wouldnt seem to be a big deal to start X w/ two different servers - one for DRI and one for Xinerama.
You use either DRI, or Xinerama, but not both. DRI+Xinerama is not supported in XFree86 currently.
That dual head bug is https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=108963
-Mark
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