I managed to get this working by cleanly uninstalling the fglrx driver and then reinstalling some components as detailed here.
http://gurrier.wordpress.com/2011/10/30/amd-video-problems-in- ubuntu-11-10-oneiric-ocelot/ This bug can be marked as closed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/875038 Title: Cannot set dual display with radeon driver on Oneiric To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/875038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
