This seems likely to be either a nvidia driver bug or compiz (and definitely not mesa -- bad bugbot).
I've flagged it for attention with the multi-monitor support specification (https://blueprints.launchpad.net/ubuntu/+spec/desktop-p -multi-monitor). For now I'll add tasks for both compiz and nvidia, until the issue is better pinpointed. ** Package changed: mesa (Ubuntu) => nvidia-graphics-drivers (Ubuntu) ** Changed in: nvidia-graphics-drivers (Ubuntu) Importance: Undecided => High ** Changed in: nvidia-graphics-drivers (Ubuntu) Status: Confirmed => Triaged ** Also affects: compiz (Ubuntu) Importance: Undecided Status: New ** Changed in: compiz (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/877438 Title: Unity compiz plugin makes display slow on multi-screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/877438/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
