Sound disappears on logout/relogin. Problem is in pulseaudio process which remains from previous login session. Killing it solves the problem - new instance start automatically then and sound plays again.
Then that's not a plasmashell problem. Whether SDDM should clear up stray processes, is up for debate (on the SDDM tracker), but there's some complexities there.
Referenced on SDDM tracker: https://github.com/sddm/sddm/issues/914
Please di(In reply to David Edmundson from comment #1) > Then that's not a plasmashell problem. > > Whether SDDM should clear up stray processes, is up for debate (on the SDDM > tracker), but there's some complexities there. Please discuss this with SDDM developers directly here: https://github.com/sddm/sddm/issues/914#issuecomment-359153535 - they said it is a plasmashell problem: >This doesn't happen with Liri for example, there the session manager launches >autostart programs (including /etc/xdg/autostart/pulseaudio.desktop) and >SIGTERM and SIGKILL if needed are sent to the process upon logout. >@davidedmundson Plasma should just keep track of the processes it starts and >kills them on logout. Is it possible?
*** This bug has been marked as a duplicate of bug 422322 ***