With alsa there is a ""Simple mixer control 'Independent HP'" if set to
* "Enable", sound is /only/ audible through the built-in speaker
* "Disable", sound is /only/ audible through the connected headphone/line-out
as pulseaudio only use device 0 for analog playback,
when independent HP is on , HP is only used for alt analog device 2
(auto mute of speaker by headphone is disabled)
when independent HP is off, HP is used by analog device 0
if your external speaker is always plugged into line out,
do you mean you want the internal speaker only auto muted by headphone but not
by line out ?
APLAY
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD1884 Analog [AD1884 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: AD1884 Alt Analog [AD1884 Alt Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
Node 0x03 [Audio Output] wcaps 0x405: Stereo Amp-Out
Control: name="Headphone Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=Out, idx=0, ofs=0
Device: name="AD1884 Alt Analog", type="Audio", device=2
Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=0
Amp-Out vals: [0x27 0x27]
Converter: stream=0, channel=0
Power states: D0 D3
Power: setting=D0, actual=D0
Node 0x04 [Audio Output] wcaps 0x405: Stereo Amp-Out
Control: name="PCM Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=Out, idx=0, ofs=0
Device: name="AD1884 Analog", type="Audio", device=0
Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=0
Amp-Out vals: [0x27 0x27]
Converter: stream=0, channel=0
Power states: D0 D3
Power: setting=D0, actual=D0
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https://bugs.launchpad.net/bugs/1251127
Title:
[HP Compaq Pro 4300 SFF PC, Realtek ID 221, Green Line Out, Rear]
Pulseaudio fails to detect card
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