[alsa-devel] Regression in Traktor Audio10 driver (snd-usb-audio) mixer flags

[Takashi Iwai]

On Fri, 08 Jan 2016 15:18:58 +0100,
Owen Williams wrote:
> 
> Sorry to bump my own thread, but I don't know how else to report bugs to
> ALSA (I think the bug tracker was abandoned a while back?).  I'm willing
> to do work to diagnose and fix this problem (I'm comfortable building
> kernels, doing git bisect, using gdb, etc) but I need some guidance
> about how to start.

If the problem is easily reproducible, could you try bisection?
This is the best way to spot out the cause.


thanks,

Takashi

> On Thu, 2015-12-31 at 13:26 -0500, Owen Williams wrote:
> > Sometime between kernels 3.13 (ubuntu 14.04) and 3.19 (15.04) there was
> > a regression that caused the mixer elements of the Traktor Audio10
> > driver to stop responding to changes to True.  I have an older machine
> > still running 14.04, and if I open alsamixer I can see and interact
> > with the 8 basic boolean switches:
> > 
> > numid=3,iface=MIXER,name='Direct Thru Channel A'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=4,iface=MIXER,name='Direct Thru Channel B'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=5,iface=MIXER,name='Direct Thru Channel C'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=6,iface=MIXER,name='Direct Thru Channel D'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=7,iface=MIXER,name='Phono Input Channel A'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=8,iface=MIXER,name='Phono Input Channel B'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=9,iface=MIXER,name='Phono Input Channel C'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > numid=10,iface=MIXER,name='Phono Input Channel D'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > 
> > 
> > or I can use amixer:
> > amixer -c T10 cset numid=8 on
> > 
> > 
> > however on my newer machine, with ubuntu 15.04 and 15.10, I am unable
> > to change the values to true.  I am a member of the audio group and I
> > have also tried with sudo, but when I try to set the value on nothing
> > happens:
> > 
> > $ amixer -c T10 cset numid=8 on
> > numid=8,iface=MIXER,name='Phono Input Channel B'
> >   ; type=BOOLEAN,access=rw------,values=1
> >   : values=off
> > 
> > The fun part is, if I connect the card to my mac I can set startup
> > conditions for these flags.  I can set them to true, and when I connect
> > to my linux machines the flags start up as true.  And then, even on the
> > newer kernel, I can turn them off!  But I can't turn them back on
> > again.
> > 
> > This sound card is the one I'd like to recommend officially for the
> > Mixxx DJ project so I'd really like to get to the bottom of this issue.
> > 
> > 
> > thanks,
> > Owen Williams
> > 
> > A Lead Developer, Mixxx.org
> 
> 
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