From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752628Ab2FIHFN (ORCPT ); Sat, 9 Jun 2012 03:05:13 -0400 Received: from cantor2.suse.de ([195.135.220.15]:39647 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751360Ab2FIHFL (ORCPT ); Sat, 9 Jun 2012 03:05:11 -0400 Date: Sat, 09 Jun 2012 09:05:10 +0200 Message-ID: From: Takashi Iwai To: Markus Trippelsdorf Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, zonque@gmail.com Subject: Re: [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC In-Reply-To: <20120608181154.GA267@x4> References: <20120608164004.GA580@x4> <20120608175043.GA5109@cucamonga.audible.transient.net> <20120608181154.GA267@x4> User-Agent: Wanderlust/2.15.6 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.7 Emacs/23.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org At Fri, 8 Jun 2012 20:11:54 +0200, Markus Trippelsdorf wrote: > > On 2012.06.08 at 17:50 +0000, Jamie Heilman wrote: > > Markus Trippelsdorf wrote: > > > 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. > > > > see patch: http://marc.info/?l=linux-kernel&m=133905533312625&w=2 > > > > You're probably getting distortion because mpd decided it would use > > a stream format that's only 8bit. > > Yes. The patch fixes the issue. Many thanks. The patch is already in sound git tree, but missed in rc2. It should be in rc3. thanks, Takashi