[alsa-devel] Fix for Asus G75 notebook subwoofer

[Massimo Del Fedele]

Il 07/11/2012 09:56, Takashi Iwai ha scritto:
> At Tue, 06 Nov 2012 18:23:51 +0100,
> Massimo Del Fedele wrote:
>>
>> Il 06/11/2012 15:24, Takashi Iwai ha scritto:
>>> At Tue, 06 Nov 2012 15:18:58 +0100,
>>> Massimo Del Fedele wrote:
>>>> Il 06/11/2012 10:06, Takashi Iwai ha scritto:
>>>>
>>>>> Could you attach to ML too?
>>>> I tried, but they're too big
>>> Did you compress it?
>> No, but I'm doing now... in compressed file are both info
> Could you post also alsa-info.sh output before applying your patch,
> too?
>
>>>>>> BTW, did you see the above patch (error in via_auto_fill_dac_nids) ?
>>>>>> My patch isn't correct either (fails when the 'continue' path is taken)
>>>>>> but it's better than now. I guess that code should be rewritten, it's
>>>>>> quite weird in respect to dac numbering.
>>>>> Could you elaborate a bit more?
>>>>>
>>>> Ok. here the original functions :
>>> Hmm... could you give a "diff -up" output instead?
>> Ok... here is te diff (with whole asus patch). I cleaned up the part of via_auto_fill_dac_nids,
>> it should be correct now in all parts, even for skipped nids.
> Actually the only place to be fixed is the assignment of
> spec->private_dac_nids[].  spec->out_path[] should correspond to
> cfg->line_out_pins[].  That is, the patch below should suffice (in
> addition to pin default changes and connection overrides for VT1802).
>
>
> thanks,
>
> Takashi
>
> ---
> diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
> index 72a2f60..1c1367b 100644
> --- a/sound/pci/hda/patch_via.c
> +++ b/sound/pci/hda/patch_via.c
> @@ -1825,7 +1825,7 @@ static int via_auto_fill_dac_nids(struct hda_codec *codec)
>   					    &spec->out_mix_path))
>   			dac = spec->out_mix_path.path[0];
>   		if (dac) {
> -			spec->private_dac_nids[i] = dac;
> +			spec->private_dac_nids[dac_num] = dac;
>   			dac_num++;
>   		}
>   	}
>
>
>
Hi...  not tested, but IMHO your patch won't  be enough; you're not updating the spec->multiout.num_dacs inside the loop,
which means that is_empty_dac(codec, conn[i]) inside __parse_output_path() will not detect used DACs as used :

static bool is_empty_dac(struct hda_codec *codec, hda_nid_t dac)
{
     struct via_spec *spec = codec->spec;
     int i;

     for (i = 0; i < spec->multiout.num_dacs; i++) { <---- HERE, using spec->multiout.num_dacs as loop end
         if (spec->multiout.dac_nids[i] == dac)
             return false;
     }
     if (spec->hp_dac_nid == dac)
         return false;
     return true;
}

You need to update spec->multiout.num_dacs INSIDE scan loop, NOT at end.

Ciao

Max