ALSA: hda - Use the primary DAC for all aamix outputs

When setting up the aamix output paths, use the primary DAC instead of
the individual DAC for each output as default.  Otherwise multiple
DACs will be turned on for a single aamix widget, which results in
doubly or more volumes, because the duplicated signals will be sent
through all these DACs for a single stream.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_generic.c

@@ -1371,22 +1371,25 @@ static int check_aamix_out_path(struct hda_codec *codec, int path_idx)
 {
 	struct hda_gen_spec *spec = codec->spec;
 	struct nid_path *path;
-	hda_nid_t dac, pin;
+	hda_nid_t path_dac, dac, pin;
 
 	path = snd_hda_get_path_from_idx(codec, path_idx);
 	if (!path || !path->depth ||
 	    is_nid_contained(path, spec->mixer_nid))
 		return 0;
-	dac = path->path[0];
+	path_dac = path->path[0];
+	dac = spec->private_dac_nids[0];
 	pin = path->path[path->depth - 1];
 	path = snd_hda_add_new_path(codec, dac, pin, spec->mixer_nid);
 	if (!path) {
-		if (dac != spec->multiout.dac_nids[0])
-			dac = spec->multiout.dac_nids[0];
+		if (dac != path_dac)
+			dac = path_dac;
 		else if (spec->multiout.hp_out_nid[0])
 			dac = spec->multiout.hp_out_nid[0];
 		else if (spec->multiout.extra_out_nid[0])
 			dac = spec->multiout.extra_out_nid[0];
+		else
+			dac = 0;
 		if (dac)
 			path = snd_hda_add_new_path(codec, dac, pin,
 						    spec->mixer_nid);