It looks like the ordering may be important. Configuring uac2 as your first function seems to resolve the issue. Must be a requirement documented somewhere, or an interesting bug. :) -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html