I tested with Oneiric's kernel http://packages.ubuntu.com/oneiric/linux-image-2.6.39-3-generic running natty userspace, and so far it seems to be working ok in either internal, external, or mirrored mode. In side-by-side mode I have trouble with regions of the screen appearing black but I suspect that is actually a Unity bug separate from X. (Have not tested in classic mode yet.)
I tested with Oneiric's kernel http:// packages. ubuntu. com/oneiric/ linux-image- 2.6.39- 3-generic running natty userspace, and so far it seems to be working ok in either internal, external, or mirrored mode. In side-by-side mode I have trouble with regions of the screen appearing black but I suspect that is actually a Unity bug separate from X. (Have not tested in classic mode yet.)