My theory is that on resume the system re-enumerates the USB bus so for a short period the internal sound card is there but the USB one isn't, causing PulseAudio to drop back to the only sound card.
But that doesn't explain why Rhythmbox still sends audio out the USB device. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/947448 Title: Volume slider forgets output device on resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/947448/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs