If I'm understanding this report correctly, the bug happens even when System Settings isn't running. If so, it isn't a bug in System Settings. I'm guessing pulseaudio.
** Package changed: ubuntu-system-settings (Ubuntu) => pulseaudio (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1488508 Title: Alarm volume set at zero and cannot be changed To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1488508/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs