[alsa-devel] limitations on number of alsa controls for a card

[Raymond Yau]

2012-11-1 下午11:01 於 "Vinod Koul" <vinod.koul at linux.intel.com> 寫道：
>
> On Thu, 2012-11-01 at 14:25 +0000, Mark Brown wrote:
> > On Wed, Oct 31, 2012 at 07:37:31PM +0530, Vinod Koul wrote:
> >
> > > Is there any limitation on maximum number of controls we can have.
> >
> > > I had some platform side controls to represent DSP and adding them
made
> > > some of codec controls to vanish. And looks like if I register these
> > > platform controls not all codec controls are visible in userpsace.
> > > Is there nay max limit I am hitting?
> >
> > Not that I'm aware of beyond sizeof() type stuff which you're probably
> > still a way away from.  How are you listing the controls and are there
> > any name collisons?
> alsa_amixer -c"cardname" controls
>
> if there isn't anything in kernel which limits this, would there be
> something in alsa-lib to have this kind of behavior?
>
> --

those inactive controls are not listed by amixer

try alsactl store -f foo.state