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

Raymond Yau superquad.vortex2 at gmail.com
Wed Mar 30 14:50:51 CEST 2011

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

AFAIK, speaker-test will fail

speaker-test -d -c 6 -t wav -Dsurround51:1


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
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