[pulseaudio-discuss] [PATCH v2 0/5] Add default volume to ports

[Raymond Yau]

>
> This is pretty much a complete rewrite of the patches that intended to
> fix bad volume behaviour on Terratec Aureon Dual USB. These patches
> add a new default volume attribute to ports and alsa-mixer paths, and
> use that to fix the Aureon volume bug[1].
>
> The default volume of all analog paths, not just Aureon, is now 30%
> instead of 100%. Also, the port default volume is now considered when
> switching ports. That means, for example, that on the first boot of
> a laptop with speakers and a headphone jack (unplugged), the speakers
> get their default volume set as before (based on the hardware volume),
> but when plugging in headphones, the sink volume jumps to 30%. That's
> a good thing, because the speaker volume won't affect the default
> headphone volume like it has affected so far.
>
> Here's a link to the v1 patch set discussion, where the device default
> volumes were discussed in some length:
> http://thread.gmane.org/gmane.comp.audio.pulseaudio.general/22253
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=81777

Is this bug of alsa mixer api  ?

The speaker playback switch is mono but speaker playback volume is stereo

amixer even show two on/off switches

Card hw:1 'U0xccd0x77'/'USB Device 0xccd:0x77 at usb-0000:00:02.0-1, full
speed'
  Mixer name : 'USB Mixer'
  Components : 'USB0ccd:0077'
  Controls      : 7
  Simple ctrls  : 3
Simple mixer control 'Mic',0
  Capabilities: pvolume pvolume-joined cvolume pswitch pswitch-joined
cswitch cswitch-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: Playback 0 - 32 Capture 0 - 16
  Mono: Playback 0 [0%] [0.00dB] [on] Capture 0 [0%] [0.00dB] [on]
Simple mixer control 'Auto Gain Control',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 151
  Mono:
  Front Left: Playback 34 [23%] [-22.25dB] [on]
  Front Right: Playback 34 [23%] [-22.25dB] [on]

!!Alsactl output
!!-------------

--startcollapse--
state.U0xccd0x77 {
control.1 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Mic Playback Switch'
value true
}
control.2 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 32'
iface MIXER
name 'Mic Playback Volume'
value 0
}
control.3 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Speaker Playback Switch'
value true
}
control.4 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 151'
iface MIXER
name 'Speaker Playback Volume'
value.0 34
value.1 34
}


>
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