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

[Owen Williams]

Unfortunately I can't narrow the problem down more specifically than
the changes from Ubuntu-3.18.0-14.14 to Ubuntu-3.19.0-1.1.  If I try to
git bisect between those, I end up with commits that don't have the
proper debian packaging information so I can't build packages.  Any
ideas?  I see a bunch of merges for the sound subsystem in the 3.19
branch so if can figure out how to build debs I bet the problem is in
there.

On Sat, 2016-01-09 at 08:42 +0100, Takashi Iwai wrote:
> 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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> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> > 
> 
>