I run Tumbleweed with two users, and sometimes I switch the graphically user
interface (gnome here) from one user to the other. When I switch, sound is
gone. The sound devices are still there, and there is even a sound level
output, no error reported in the logs, but no sound is actually played. To
workaround this, I have to run "alsactl restore" in a root session after
switching the user, then sound is back again. When I switch back to the other
user, same thing happens again. This behaviour differs from tumbleweed a few
weeks ago, where sound just works for the current user that has control of the
GUI.

Please tell me which logs I shall provide in case something is needed.