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

[Takashi Iwai]

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