Oh, I should say I've also just recently seen similar problems (for no apparent reason) when an XHCI (3.0) controller hands off a full-speed (1.1) isochronous device. Is the port this is being plugged into a USB 3.0 port ('SuperSpeed')? Monty _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user