The volume control icon is not shown in the system tray. There is a blank space for it but no icon. This is on some version 5 of KDE. Apparently version information is no longer shown on 'Help | About KDE'. Reproducible: Always Steps to Reproduce: 1. boot the system 2. 3. Actual Results: No volume control icon in system tray Expected Results: Volume control icon should be displayed in the system tray when enabled.
See https://bugs.kde.org/show_bug.cgi?id=352055 , https://bugreports.qt.io/browse/QTBUG-48870 and http://lists.opensuse.org/opensuse-factory/2015-12/msg00133.html
*** This bug has been marked as a duplicate of bug 352055 ***