I just upgraded to 17.10 from 17.04, now the sound volume control does not work. I can hear sound, but cannot control volume, even I completely "mute" the sound from the top-right system menu, it is still playing.
I can control volume inside the playing application, e.g. chrome or smplayer, but the system volume control does not work at all.
Also, from the system settings application, there is no sound device listed at all.