[pulseaudio-discuss] [PATCH] alsa-mixer: Add "Line Out" to known mixer controls

[Raymond Yau]

> ---
>  src/modules/alsa/mixer/paths/analog-output-headphones-2.conf   | 4 ++++
>  src/modules/alsa/mixer/paths/analog-output-headphones.conf     | 4 ++++
>  src/modules/alsa/mixer/paths/analog-output-lineout.conf        | 6 ++++++
>  src/modules/alsa/mixer/paths/analog-output-speaker-always.conf | 4 ++++
>  src/modules/alsa/mixer/paths/analog-output-speaker.conf        | 4 ++++
>  5 files changed, 22 insertions(+)
>
> diff --git a/src/modules/alsa/mixer/paths/analog-output-headphones-2.conf
b/src/modules/alsa/mixer/paths/analog-output-headphones-2.conf
> index ddabf77..1028b93 100644
> --- a/src/modules/alsa/mixer/paths/analog-output-headphones-2.conf
> +++ b/src/modules/alsa/mixer/paths/analog-output-headphones-2.conf
> @@ -47,6 +47,10 @@ volume = off
>  switch = mute
>  volume = zero
>
> +[Element Line Out]
> +switch = off
> +volume = off

Do any computer have two headphone jacks and Line Out Playback Volume ?

> +
>  [Element Headphone+LO]
>  switch = mute
>  volume = zero
> diff --git a/src/modules/alsa/mixer/paths/analog-output-headphones.conf
b/src/modules/alsa/mixer/paths/analog-output-headphones.conf
> index b6ee70b..a7a2140 100644
> --- a/src/modules/alsa/mixer/paths/analog-output-headphones.conf
> +++ b/src/modules/alsa/mixer/paths/analog-output-headphones.conf
> @@ -68,6 +68,10 @@ override-map.2 = all-left,all-right
>  switch = off
>  volume = off
>
> +[Element Line Out]
> +switch = off
> +volume = off

http://freedesktop.org/software/pulseaudio/doxygen/volume.html

Hence it is usually a better idea to treat all volume values as opaque with
a range from PA_VOLUME_MUTED (0%) to PA_VOLUME_NORM (100%) and to refrain
from any calculations with them.

Pulseaudio merge two controls (playback switch and playback volume ) into
it volume scale

It is a design problem of pulseaudio vokume scale

Do it mean pulseaudio won't restore line out playback volume when headphone
is unplugged ?

> diff --git
a/src/modules/alsa/mixer/paths/analog-output-speaker-always.conf
b/src/modules/alsa/mixer/paths/analog-output-speaker-always.conf
> index b6d9f94..101edd8 100644
> --- a/src/modules/alsa/mixer/paths/analog-output-speaker-always.conf
> +++ b/src/modules/alsa/mixer/paths/analog-output-speaker-always.conf
> @@ -68,6 +68,10 @@ volume = zero
>  switch = mute
>  volume = zero
>
> +[Element Line Out]
> +switch = off
> +volume = off
> +
>  [Element Headphone+LO]
>  switch = off
>  volume = off
> diff --git a/src/modules/alsa/mixer/paths/analog-output-speaker.conf
b/src/modules/alsa/mixer/paths/analog-output-speaker.conf
> index 39193dd..e3b6c54 100644
> --- a/src/modules/alsa/mixer/paths/analog-output-speaker.conf
> +++ b/src/modules/alsa/mixer/paths/analog-output-speaker.conf
> @@ -84,6 +84,10 @@ volume = off
>  switch = off
>  volume = off
>
> +[Element Line Out]
> +switch = off
> +volume = off
> +
>  [Element Speaker+LO]
>  required-any = any
>  switch = mute
> --
>
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