I'm attaching a PulseAudio log here. The device that causes the issue is the Topping VX2.
** Attachment added: "pulseverbose.log" https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1560181/+attachment/4618083/+files/pulseverbose.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1560181 Title: [USB-Audio - VX2, playback] Pulseaudio fails to detect card To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1560181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs