Chris, notifications have an urgency level associated with them. That's what defines which one should appear first in the case one is triggered when another is already being shown.
$ DEBUG=1 /usr/lib/notify-osd/notify-osd -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in ubuntu. https://bugs.launchpad.net/bugs/482384 Title: Battery Discharging notification urgency -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
