[pulseaudio-discuss] Splitting ALSA card ports into

[Raymond Yau]

>>>> > I am trying to get simultaneous output on the Line Out and Headphones
>>>> > outputs of my Intel HD Audio (AsRock Z97 motherboard) chipset and PC
>>>> > case. With the default pulseaudio configuration in pavucontrol I can
>>>> > choose Analog Stereo Duplex and then select either the "Line Out" or
>>>> > "Headphones" port under "Output Devices", but I would like to have
>>>> > simultaneous output on both (by having a seperate sink for each).
>>>> >
>>>> > Here is my alsa-info.sh output, please ignore the NVidia output
>>>> > provided by my GPU as I would like to not use it if possible:
>>>> >
>>>
>>>
>>>
http://www.alsa-project.org/db/?f=b7e5097f7a899aa5294b147b23cbb877db3b6f3c
>>>>
>>>> > And this is what "pacmd list-sinks" says about the Built-In audio
sink:
>>>> > http://hastebin.com/bonadehimu
>>>>
>>>> It's not possible to have independent line out and headphone output on
>>>> your hardware. There is only one analog device on your card.
>>>>
>>>> --
>>>
>>>
>>> The easy way to output same audio to both output is disable drivers auto
>>> mute mode and change pulseaudio conf files
>>>
>>> Simple mixer control 'Auto-Mute Mode',0
>>> Capabilities: enum
>>> Items: 'Disabled' 'Enabled'
>>> Item0: 'Enabled'
>>>
>>>
>>>
http://www.intel.com/content/www/us/en/support/boards-and-kits/desktop-boards/000007156.html
>>>
>>>
>>>
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio.txt
>>>
>>> You have to ask Tiwai to enable independent hp for your realtek codec on
>>> desktop ( e.g. no internal mic and hda controller
>>> support enough SDO)
>>>
>>> You can specify hint indep_hp=1 by early patching,  the driver
>>> automatically disable automute when you switch on independent hp switch
>>>
>>>
>>>
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio-Controls.txt
>>>
>>> Independent HP When this enum control is enabled, the headphone output
is
>>> routed from an individual stream (the third PCM such as hw:0,2) instead
of
>>> the primary stream
>>
>>
>> Okay, so following your advice I set up modprobe.d to specify the
>> early-patching files:
>>
>> $ cat /etc/modprobe.d/snd_hda_intel.conf
>> options snd_hda_intel patch=onboard-patch,hdmi-patch
>>
>> and specified the hint in /lib/firmware/onboard-patch:
>>
>> $ cat /lib/firmware/onboard-patch
>> [codec]
>> 0x10ec0892 0x1849d892 0
>>
>> [hint]
>> indep_hp = 1
>>
>> this seems to work fine, I can query the card hints and indep_hp shows
up:
>>
>> $ cat /sys/class/sound/hwC0D0/hints
>> indep_hp = 1
>>
>> but pulseaudio still only shows one sink. Do I need to manually load
>> another sink module?
>
>
> also, my alsa-info after now:
http://www.alsa-project.org/db/?f=f7de54b96d1cb50391d638e3bc687730daf17a2f
>
> so there now is a new "Alt-Analog" playback device:
>
> >
> APLAY
>
> **** List of PLAYBACK Hardware Devices ****
> card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 2: ALC892 Alt Analog [ALC892 Alt
Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> ARECORD
>
> **** List of CAPTURE Hardware Devices ****
> card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 2: ALC892 Alt Analog [ALC892 Alt
Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
>
> So I tried adding a second module-alsa-card:
>
> $ pacmd load-module module-alsa-sink card_name=alsa_card.pci-0000_00_1b.2
> Module load failed
>
> (changed the .0 to .2 because thats the Alt Analog right?)

You also need hint

jack_detect=no

https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output-headphones.conf

Don't mute surround71 playback switches and don't turn off  volume

https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output-lineout.conf

Don't mute headphone playback switch and don't turn off volume

You need to enable 'independent hp' and set 'input source',1 to front mic
before starting  pulseaudio server

Simple mixer control 'Independent HP',0
Capabilities: enum
Items: 'Disabled' 'Enabled'
Item0: 'Enabled'

Simple mixer control 'Input Source',1
Capabilities: cenum
Items: 'Front Mic' 'Rear Mic' 'Line'
Item0: 'Front Mic'

Use application (e.g. mplayer) which allow you to specify device hw:0,2

https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/profile-sets/default.conf

Just add a new mapping

[Mapping alt-analog-stereo]
device-strings = hw:%f,2
channel-map = left,right
paths-output = analog-output-headphones
paths-input = analog-input-front-mic
priority = 10
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