I have a worse bug : after setting alsamixer to 6ch and restarting pulseaudio,
I have no rear sound and no dialog in 5.1 application (I select a 5.1 profile
in pulseaudio
+ the sound section in Ubuntu setting pannel is unable to test the speakers
(they remain silent while the system sound can
Workaround that seems to work (Ubuntu system with systemd and
pulseaudio)
Create this file "~/.config/systemd/user/pulseaudio.preconf.service"
with this content
[Unit]
Description=Sound Service PreConf
ConditionUser=!root
[Service]
Type=oneshot
ExecStart=amixer set "Channel mode" "6ch"
[Expired for alsa-driver (Ubuntu) because there has been no activity for
60 days.]
** Changed in: alsa-driver (Ubuntu)
Status: Incomplete => Expired
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http://www.intel.com/support/motherboards/desktop/sb/CS-034198.htm
Audio jack retasking is a feature that allows a jack to support more
than one function. For example, the pink audio jack can support
microphone input when the system configuration is set to stereo mode,
2-channel, and as
you need to add hook to front device and surround40 in order to get back
the input jacks after probing surround51
hooks.0 {
type ctl_elems
hook_args [
{
name "Channel Mode"
control.1 {
iface MIXER
name 'Channel Mode'
value '2ch'
comment {
access 'read write'
type ENUMERATED
count 1
item.0 '2ch'
hooks.0 {
type ctl_elems
hook_args [
{
name "Channel Mode"
preserve true
value "6ch"
lock true
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