[alsa-devel] [PATCH] ALSA: hda - Fix wrong detection of "Headphone+LO" or "Speaker+LO"

[David Henningsson]

Hi Ingo and thanks for trying to improve the driver,

I've been reading through the alsa-devel thread but your alsa-info was 
removed when it was posted to the list so it's a bit hard to see the 
context.

If I understand correctly, you have three DACs, one internal speaker, 
one headphone jack, and three jacks that are both used for 5.1 surround 
and line out/mic/line in. Is this correct?

How do the DACs get assigned in this case? One would assume that you'd 
get 02 -> Front LO, HP, Speaker, 03 -> Rear LO, 04 -> CLFE LO. And then 
the volume/mute control for DAC node 02 would be called "PCM" (since 
both hp_lo_shared and spk_lo_shared are true), but in fact it would be 
more appropriate to call it "Front".

Anyhow, I'd say that the typical case where we want the "Headphone+LO" 
names is where we have only one LO, and then multiout.num_dacs would be 
1, not 2. (I think, it was a while since I looked into that part of the 
driver...)

// David

On 2015-03-03 12:22, Ingo Brückl wrote:
> Add the constraint mentioned in the comment.
>
> It does not apply to a scenario with three DACs and multi-IO where we
> would normally get a "Master Playback Volume" and a "Front Playback
> Volume" (prevented without checking for num_dacs).
>
> Signed-off-by: Ingo Brückl <ib at wupperonline.de>
>
> diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
> index ecee349..4c8910c 100644
> --- a/sound/pci/hda/hda_generic.c
> +++ b/sound/pci/hda/hda_generic.c
> @@ -1097,7 +1097,7 @@ static const char *get_line_out_pfx(struct hda_codec *codec, int ch,
>   	case AUTO_PIN_LINE_OUT:
>   		/* This deals with the case where we have two DACs and
>   		 * one LO, one HP and one Speaker */
> -		if (!ch && cfg->speaker_outs && cfg->hp_outs) {
> +		if (!ch && spec->multiout.num_dacs == 2 && cfg->speaker_outs && cfg->hp_outs) {
>   			bool hp_lo_shared = !path_has_mixer(codec, spec->hp_paths[0], ctl_type);
>   			bool spk_lo_shared = !path_has_mixer(codec, spec->speaker_paths[0], ctl_type);
>   			if (hp_lo_shared && spk_lo_shared)
> --
> 1.7.10
>

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic