I have a similar problem - when I plug my USB mic in, it only shows up in the 'Hardware' tab, and not in the 'Input' tab. If I kill pulseaudio with 'pulseaudio -k' it works as expected again.
I debuged pulseaudio to find out that the problem is in function 'rd_acquire' - pulseaudio can't connect to DBus. The reason it can't connect is that the DBus session no longer exists. Here's what's really happening: When an user logs in, everything works as expected. When the user logs out, the DBus process is killed, but the pulseaudio process keeps running. When the user logs in again, a new DBus session is started, but the pulseaudio proccess is still the old one with an invalid DBus reference. The connection thus fails. The clear solution would be to kill pulseaudio on logout. However, it seems pulseaudio was designed not to exit on logout ( https://bugzilla.redhat.com/show_bug.cgi?id=484969 ). The pulseaudio should be able to reconnect to a new DBus session eventually. Related: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=593952 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594001 ** Bug watch added: Red Hat Bugzilla #484969 https://bugzilla.redhat.com/show_bug.cgi?id=484969 ** Bug watch added: Debian Bug tracker #593952 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=593952 ** Bug watch added: Debian Bug tracker #594001 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594001 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/878028 Title: [USB-Audio - UAC3553B, playback] No sound at all To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/878028/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
