[alsa-devel] [PATCH] add Steinberg UR44 USB Audio Interface support to quirks-table

Clemens Ladisch clemens at ladisch.de
Mon Mar 10 16:40:52 CET 2014

Cyrus Harmon wrote:
> The attached patch provides support for the Steinberg UR44 USB Audio
> Interface. It’s nothing more than Clemens’ patch to support the UR22,
> with the device ID modified for the UR44. The patch was tested with
> kernel versions 3.12.11 and 3.12.12 and I have primarily used it with
> a PREEMPT RT-patched 3.12.12-rt kernel.

In theory, kernel 3.11 and later should support this device without
a quirk entry.  I guess it actually does not?

> I should note that on one of the systems that I used to test the patch
> I was never able to achieve xrun-free JACK performance at -p256 -n3 as
> I would invariably see xruns roughly once every minute.

This sounds as if the playback stream needs to be synchronized to the
recording stream.

What is the output of "lsusb -v" for this device?


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