*
         * Synchronizing the playback rate to the capture rate is done by using
         * the same sequence of packet sizes for both streams.
         * Submitting a playback URB therefore requires both a ready URB and
         * the size of the corresponding capture packet, i.e., both playback
         * and capture URBs must have been completed.  Since the USB core does
         * not guarantee that playback and capture complete callbacks are
         * called alternately, we use two FIFOs for packet sizes and read URBs;
         * submitting playback URBs is possible as long as both FIFOs are
         * nonempty.
         */

the driver seem expect same rate for playback and capture

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https://bugs.launchpad.net/bugs/986817

Title:
   UA-101 - UA-101, playback  Pulseaudio fails to detect card

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