* [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC
@ 2012-06-08 16:40 Markus Trippelsdorf
2012-06-08 17:50 ` Jamie Heilman
0 siblings, 1 reply; 4+ messages in thread
From: Markus Trippelsdorf @ 2012-06-08 16:40 UTC (permalink / raw)
To: alsa-devel; +Cc: linux-kernel, zonque, tiwai
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
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC
2012-06-08 16:40 [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC Markus Trippelsdorf
@ 2012-06-08 17:50 ` Jamie Heilman
2012-06-08 18:11 ` Markus Trippelsdorf
0 siblings, 1 reply; 4+ messages in thread
From: Jamie Heilman @ 2012-06-08 17:50 UTC (permalink / raw)
To: Markus Trippelsdorf; +Cc: alsa-devel, linux-kernel, zonque, tiwai
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.
--
Jamie Heilman http://audible.transient.net/~jamie/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC
2012-06-08 17:50 ` Jamie Heilman
@ 2012-06-08 18:11 ` Markus Trippelsdorf
2012-06-09 7:05 ` Takashi Iwai
0 siblings, 1 reply; 4+ messages in thread
From: Markus Trippelsdorf @ 2012-06-08 18:11 UTC (permalink / raw)
To: alsa-devel, linux-kernel, zonque, tiwai
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.
--
Markus
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC
2012-06-08 18:11 ` Markus Trippelsdorf
@ 2012-06-09 7:05 ` Takashi Iwai
0 siblings, 0 replies; 4+ messages in thread
From: Takashi Iwai @ 2012-06-09 7:05 UTC (permalink / raw)
To: Markus Trippelsdorf; +Cc: alsa-devel, linux-kernel, zonque
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
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-06-09 7:05 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2012-06-08 16:40 [Bisected] ALSA: snd-usb: New streaming logic causes distortions on Burr-Brown DAC Markus Trippelsdorf
2012-06-08 17:50 ` Jamie Heilman
2012-06-08 18:11 ` Markus Trippelsdorf
2012-06-09 7:05 ` Takashi Iwai
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