control.1 {
iface MIXER
name 'Channel Mode'
value '2ch'
comment {
access 'read write'
type ENUMERATED
count 1
item.0 '2ch'
item.1 '4ch'
item.2 '6ch'
}
}
this channel mode control limit the availability of 5.1 since the two input
jacks have to retask as output jacks
you need to discuss this issue in alsa-devel mailing list and
pulseaudio-discuss mailing list
possible way is to add hook which change channel mode when using
surround40, surround51
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/cards/HDA-Intel.conf;hb=HEAD
similar to
http://git.alsa-project.org/?p=alsa-
lib.git;a=blob;f=src/conf/cards/ICH4.conf;hb=HEAD
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https://bugs.launchpad.net/bugs/1505584
Title:
[Realtek ALC887-VD] Playback only through 2 channels by default
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