Then try to pass implicit_fb=1 option to snd-usb-audio module. It's a new option that was added recently. Takashi
Nice, that did the trick. there was a small glitch on first playback but I can not reproduce it now. Playback seems glitch-free now. I will test it with pulseaudio in the gui if I can. It's not quite easy to test, because the system locks up after a while with the new kernel and gnome 3. I will also test concurrent playback and recording, too. Thank you very much, that was a huge help!
Kilian
