[ALSA] Fix silent output on some machines with AD1981x codecs

AC97 Codec
Fixed the default state of 'Headphone Jack Sense' switch on AD1981x
codecs.  Setting this on affects the output of some machines (e.g.
Thindpads).

The default value is set on only hardwares which are known to work.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_patch.c

@@ -1107,13 +1107,25 @@ static struct snd_ac97_build_ops patch_ad1981a_build_ops = {
 #endif
 };
 
+static void check_ad1981_hp_jack_sense(ac97_t *ac97)
+{
+	u32 subid = ((u32)ac97->subsystem_vendor << 16) | ac97->subsystem_device;
+	switch (subid) {
+	case 0x103c0890: /* HP nc6000 */
+	case 0x103c006d: /* HP nx9105 */
+		/* enable headphone jack sense */
+		snd_ac97_update_bits(ac97, AC97_AD_JACK_SPDIF, 1<<11, 1<<11);
+		break;
+	}
+}
+
 int patch_ad1981a(ac97_t *ac97)
 {
 	patch_ad1881(ac97);
 	ac97->build_ops = &patch_ad1981a_build_ops;
 	snd_ac97_update_bits(ac97, AC97_AD_MISC, AC97_AD198X_MSPLT, AC97_AD198X_MSPLT);
 	ac97->flags |= AC97_STEREO_MUTES;
-	snd_ac97_update_bits(ac97, AC97_AD_JACK_SPDIF, 1<<11, 1<<11); /* HP jack sense */
+	check_ad1981_hp_jack_sense(ac97);
 	return 0;
 }
 
@@ -1144,7 +1156,7 @@ int patch_ad1981b(ac97_t *ac97)
 	ac97->build_ops = &patch_ad1981b_build_ops;
 	snd_ac97_update_bits(ac97, AC97_AD_MISC, AC97_AD198X_MSPLT, AC97_AD198X_MSPLT);
 	ac97->flags |= AC97_STEREO_MUTES;
-	snd_ac97_update_bits(ac97, AC97_AD_JACK_SPDIF, 1<<11, 1<<11); /* HP jack sense */
+	check_ad1981_hp_jack_sense(ac97);
 	return 0;
 }