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 <[email protected]>
Date: Thu Apr 12 13:51:13 2012 +0200
ALSA: snd-usb: remove old streaming logic
commit edcd3633e72a1590c4cf46befe5e6cd03b5aec3e
Author: Daniel Mack <[email protected]>
Date: Thu Apr 12 13:51:12 2012 +0200
ALSA: snd-usb: switch over to new endpoint streaming logic
--
Markus
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/
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
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