[thomasmeeks]

A single X session cannot span two graphics cards. X just doesn't support it. You're waiting on Mir or Wayland for that one.

If you manage to get all four monitors on one card somehow, X can handle the multiple geometries just fine. Though it will generally do a terrible job of automatically detecting the right resolution.

Love Linux, but this bit does disappoint.

[eropple]

I'm not waiting on anything. OS X supports it fine, and with a desktop environment on top that's much better for me.