SUMMARY The volume window is not centred with different window managers in X11. STEPS TO REPRODUCE 1. Install Openbox or Fluxbox or JWM 2. Start the window manager with --replace if necessary 3. Press volume down/up on keyboard OBSERVED RESULT The volume popup appears in a random corner. EXPECTED RESULT The volume popup appears in the center, as it would for KWin. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.10.0-19-amd64 KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION Tested positive on JWM version 2.4 and Openbox version 3.6.1 X.org version 1.20.11-1
It also appears below fullscreen windows.
The volume popup is of type "OSD" and it's up to the window manager to position these. KWin centers them, but other window managers might do something different.