[alsa-devel] [RFC Patch] ALSA - EMU10K1 - Remove Center LFE Wave Center and Wave LFE control for SB Live! Platinum

[Takashi Iwai]

At Wed, 6 Apr 2011 10:15:21 +0800,
Raymond Yau wrote:
> 
> 2011/4/4 Takashi Iwai <tiwai at suse.de>
> 
> > At Wed, 30 Mar 2011 20:50:51 +0800,
> > Raymond Yau wrote:
> > >
> > > SB Live! Platinum CT4760P is just a 4 channels sound card with STAC9721
> > and
> > > Philips UDA1334 DAC
> > >
> > > Is it feasible to remove "Center" , "LFE", "Wave Cetner" and "Wave LFE"
> > > Playback Volume control ?
> > >
> > > or add a bitmap to disable the creation of those controls
> > >
> > > Anyone know whether this patch has any side effect for the user with
> >  Live
> > > Drive
> >
> > The side-effect is that opening surround51 would spew annoying error
> > messages as you've seen.  It should return an error without much
> > complaint.
> >
> > I'm not sure what is the best way to solve it.
> > Defining another conf such as EMU10K1-4ch.conf would be an option,
> > but it's not elegant...
> >
> >
> > thanks,
> >
> > Takashi
> >
> > > AFAIK, speaker-test will fail
> > >
> > > speaker-test -d -c 6 -t wav -Dsurround51:1
> > >
> > > speaker-test 1.0.24.2
> > >
> > > Playback device is surround51:1
> > > Stream parameters are 48000Hz, S16_LE, 6 channels
> > > WAV file(s)
> > > ALSA lib setup.c:565:(add_elem) Cannot obtain info for CTL elem
> > > (MIXER,'Headphone Center Playback Switch',1,0,0): No such file or
> > directory
> > > Playback open error: -2,No such file or directory
> >
> 
> 
> The point is those 4.1 speakers for SB Live!, SB Live! Platinum and SB Live!
> Value only have green jack and blue jack,  the signal of the Subwoofer is
> produced from the those jacks
> 
> it seem that the device "surround41" is only for SB Live! 5.1 in alsa
> 
>     slave.channels 6
>     ttable.0.0 1
>     ttable.1.1 1
>     ttable.2.2 1
>     ttable.3.3 1
>     ttable.4.5 1
>     hint {
>         description "4.1 Surround output to Front, Rear and Subwoofer
> speakers"
>         device $DEV
>     }

OK, I overlooked that the problematic controls are "Headphone XXX".
These should be marked as optional in the card config.
I fixed this now.

Meanwhile, as no obvious problem is found in your patch, I applied it
now.


thanks,

Takashi