i'm a (not so happy anymore) owner of a us224 which does all the same path as your us122,,. i am sloppy and the systems i use this lovely piece of h/w is not what you'd call the latest and greatest so (my) the state of things at the time of this writing, is the following: - on 3.4.x-rt it still works but only like a plain usb1 device (-r48000 -p128 -n3); good old and awesome, special fast and low-latency rawusb/hwdep mode of operation is dead. or it seems so - on 3.8.x-rt it doesn't work at all; always nagging the device's being used by something else (and no, it's not pulseaudio:); and if you dare to use jack1 then, well, it just crashes the whole show (kernel oops) only tested with preempt_rt though (thus the -rt suffix above)... i know this does not help in anything but at least you're not alone :) cheers