[alsa-devel] HDA Mono out

[Takashi Iwai]

At Sat, 11 Aug 2012 20:19:43 +0800,
Raymond Yau wrote:
> 
> How can the driver differentiate those mono internal chassis speaker of
> desktop from those subwoofer speaker of laptop?

It depends on the configuration.  In general, if multiple speaker pins
are specified, it's handled as surround.
(We have still an open issue how to handle LFE speaker pin, though.)

OTOH, there is usually a single mono pin, and if specified, usually
there is no other speaker pin.  So, mono pin is most likely a
speaker (unless conflicting with others).

> https://launchpadlibrarian.net/34863455/Card0.Codecs.codec.2.txt
> 
> Node 0x13 [Pin Complex] wcaps 0x40010c: Mono Amp-Out
> Amp-Out caps: ofs=0x1f, nsteps=0x1f, stepsize=0x05, mute=1
>   Amp-Out vals:  [0x00]
>   Pincap 0x00000010: OUT
>   Pin Default 0x911711f0: [Fixed] Speaker at Int Rear
>    Conn = Analog, Color = Black
>     DefAssociation = 0xf, Sequence = 0x0
>     Misc = NO_PRESENCE
>   Pin-ctls: 0x40: OUT
>   Connection: 1
>      0x2d
> 
> refer to the patch
> 
> hda: Added mono_out_pin to autoconfig
> 
> Added a mono_out_pin field to autocfg struct, and code to parse for the
> mono_out_line.
> 
> http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=blobdiff;f=sound/pci/hda/hda_codec.c;h=df927be176af87e1f262b4a6b0809fe1ef0ed757;hp=f6a9a5dd9b7459d13527d0ead11db2a03160e6cb;hb=90da78bf6aaabd4d31c6663b7c1d1b9c5a8c023f;hpb=cd93dc8ccad8680f104c9134ae73888feb14e946
> 
> does any computer really has the mono jack using the mono pin complex?

Yes.

> do pulseaudio classify those mono internal chassis speaker as desktop
> speaker path or speaker path?
> 
> http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
> 
> in patch_analog.c, "mono playback switch" is created in 6stack. 3stack and
> laptop model.  the auto model need to handle the speaker of the laptop
> implementation but lenovo 3000 workstation contain the internal chassis
> speaker which hda auto parser put it in speaker_pins instead of mono_out
> 
> if ((err = ad1988_auto_create_multi_out_ctls(spec, &spec->autocfg)) < 0 ||
>     (err = ad1988_auto_create_extra_out(codec,
> spec->autocfg.speaker_pins[0],
> "Speaker")) < 0 ||
>      (err = ad1988_auto_create_extra_out(codec, spec->autocfg.hp_pins[0],
> "Headphone")) < 0 ||
>     (err = ad1988_auto_create_analog_input_ctls(codec, &spec->autocfg)) < 0)
> return err;
> 
> one possible way to fix this bug for lenovo 3000 by checking wcaps of the
> pin support mono/stereo in ad1988_auto_create_extra_out and create the mono
> playback switch for the internal chassis speaker instead of the speaker
> playback volume/switch since mono out pin have to share audio output 0x04
> with green jack at rear panel.

AD codec parser needs a bigger rewrite...  In near future, it could
just follow the standard auto-parser.  But due to lack of time, the
work for the improved generic auto-parser has stalled, so far.


Takashi