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Date: Fri, 8 Jun 2012 18:40:04 +0200
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org, zonque@gmail.com, tiwai@suse.de
Subject: [Bisected] ALSA: snd-usb: New streaming logic causes distortions on
 Burr-Brown DAC
Message-ID: <20120608164004.GA580@x4>
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I hear distortions on my Burr-Brown USB DAC whenever the (software)
volume is set to some value lower than 100% in mpd. The lower the volume
the bigger are the resulting distortions.

I've bisected this to the two commits below:
(One wouldn't compile without the other)

commit d399ff9593e088d33fb38f5206c6427825892baa
Author: Daniel Mack <zonque@gmail.com>
Date:   Thu Apr 12 13:51:13 2012 +0200

    ALSA: snd-usb: remove old streaming logic

commit edcd3633e72a1590c4cf46befe5e6cd03b5aec3e
Author: Daniel Mack <zonque@gmail.com>
Date:   Thu Apr 12 13:51:12 2012 +0200

    ALSA: snd-usb: switch over to new endpoint streaming logic

-- 
Markus