I'm trying to figure out how to get control of JACK (maybe dbus...not sure) after it seems to have lost it way. (I've found that with my ffado setup, that sometimes power cycle on the device will clear the error and allow jack to start again, but with a usb device an unplug/plug doesn't seem to be effective.)
I've posted about this before and it was noted that there has been plenty discussion of this on the list...so I went off to search the archives.
But, LAU website has a link for more info...it gets a 404 error. (