ALSA: ac97 - Enable mono-out on ALC203 codec as default

Use pin 37 for mono-out as default on ALC203.

Reported-by: george pee <georgepee@gmail.com>
Tested-by: george pee <georgepee@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index f4fbc79..bb028f8 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -2560,6 +2560,14 @@
 	return 0;
 }
 
+/*
+ * realtek ALC203: use mono-out for pin 37
+ */
+static int patch_alc203(struct snd_ac97 *ac97)
+{
+	snd_ac97_update_bits(ac97, 0x7a, 0x400, 0x400);
+	return 0;
+}
 
 /*
  * realtek ALC65x/850 codecs