At least for AMD the reason is obvious. My Xorg.0.log says that the composite extension is not loaded.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/894132 Title: unity does not start using xinerama and multi-monitor To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/894132/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
