[pulseaudio-discuss] [PATCH 2/2] alsa: Add surround 2.1 profile

Raymond Yau superquad.vortex2 at gmail.com
Tue Feb 11 19:02:23 PST 2014

2014-02-11 5:28 GMT+08:00 David Henningsson <david.henningsson at canonical.com

> Are you ok if I push this one to master (just this one, not the chmap
> API one)? I was hoping for a review but it seems nobody reviewed before
> freeze time and I was on parental leave so missed the freeze date.
> I just think it'll help quite a few people with laptop subwoofers so
> would be good to have support for it.

Is this 2.1 profile only used for the sonic master external subwoofer which
connect through a Proprietary jack of asus notebook using alc66x codec

How about those internal subwoofer of other asus notebook (e.g. g75vw using
vt1802  4channel) ?


the headphone and internal speaker have to share the PCM playback volume
control while the subwoofer use it own volume control

> +[Mapping analog-surround-21]
> +device-strings = surround21:%f surround40:%f
> +channel-map = front-left,front-right,lfe,lfe
> +paths-output = analog-output analog-output-lineout analog-output-speaker
> +priority = 8
> +direction = output
> +

what is the analog-output-desktop-speaker used for ?

do any desktop really use [Element Desktop Speaker] ?

those business desktops usually have internal speakers

sometime the line out and internal speaker share a volume control when four
channels codec have three outputs


and somethime the driver assign PCM playback volume when the speaker path
and line out path share the same audio output even when two channels codec
have three volume controls


for home desktop, most users does not install internal speaker since there
are lots of noisy cooling fans inside the chassis
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