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alsa-mixer: Prefer moving "Capture" before moving boosts

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Some HD-audio codecs (at least ALC269VB and ALC283) become quite noisy on
high Mic Boost levels. So e g, if there is a "Mic Boost" and a "Capture"
control, both ranging from 0 dB to +30 dB, you get better quality if
"Mic Boost" is 0 dB and "Capture" is +30 dB, than the other way around.

By changing the order in the configuration files, this patch makes us prefer
leaving "Mic Boost" low and "Capture" high if the user selects a medium gain.

(This is based on limited experience, and there is no guarantee that there are
no sound cards that work the other way around, and therefore this patch could
potentially regress quality on those machines. Hopefully those are fewer, so
this is what we should default to.)

BugLink: https://bugs.launchpad.net/1085402
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2013-08-02 15:03:26 +02:00
parent 55e169655d
commit e6051cdf8d
8 changed files with 48 additions and 50 deletions
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12
src/modules/alsa/mixer/paths/analog-input-rear-mic.conf
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@ -30,6 +30,12 @@ required-any = any
state.plugged = unknown
state.unplugged = unknown
[Element Capture]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Rear Mic Boost]
required-any = any
switch = select
@ -50,12 +56,6 @@ volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Capture]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
[Element Input Source]
enumeration = select