sorry but to solve Google address book and calendar sync problems i updated my 42.2 with KDE applications http://download.opensuse.org/repositories/KDE:/Applications/KDE_Frameworks5_openSUSE_Leap_42.2/ KDE Framewoks5 http://download.opensuse.org/repositories/KDE:/Frameworks5/openSUSE_Leap_42.2/ Qt 5 http://download.opensuse.org/repositories/KDE:/Qt5/openSUSE_Leap_42.2/ i can't test your backport. i can say that plasma5-pa 5.9.5 solved this sound notification setting problem.