diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 74ed81081478..a9eec2a2357d 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -143,6 +143,7 @@ static const struct ac97_codec_id snd_ac97_codec_ids[] = {
 { 0x43525970, 0xfffffff8, "CS4202",		NULL,		NULL },
 { 0x43585421, 0xffffffff, "HSD11246",		NULL,		NULL },	// SmartMC II
 { 0x43585428, 0xfffffff8, "Cx20468",		patch_conexant,	NULL }, // SmartAMC fixme: the mask might be different
+{ 0x43585431, 0xffffffff, "Cx20551",           patch_cx20551,  NULL },
 { 0x44543031, 0xfffffff0, "DT0398",		NULL,		NULL },
 { 0x454d4328, 0xffffffff, "EM28028",		NULL,		NULL },  // same as TR28028?
 { 0x45838308, 0xffffffff, "ESS1988",		NULL,		NULL },
diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index 641d0c8d659e..bfc2fed16da3 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -1338,6 +1338,12 @@ int patch_conexant(struct snd_ac97 * ac97)
 	return 0;
 }
 
+int patch_cx20551(struct snd_ac97 *ac97)
+{
+	snd_ac97_update_bits(ac97, 0x5c, 0x01, 0x01);
+	return 0;
+}
+
 /*
  * Analog Device AD18xx, AD19xx codecs
  */
diff --git a/sound/pci/ac97/ac97_patch.h b/sound/pci/ac97/ac97_patch.h
index 94340daaaf1f..555d1c9a98fd 100644
--- a/sound/pci/ac97/ac97_patch.h
+++ b/sound/pci/ac97/ac97_patch.h
@@ -39,6 +39,7 @@ int patch_sigmatel_stac9758(struct snd_ac97 * ac97);
 int patch_cirrus_cs4299(struct snd_ac97 * ac97);
 int patch_cirrus_spdif(struct snd_ac97 * ac97);
 int patch_conexant(struct snd_ac97 * ac97);
+int patch_cx20551(struct snd_ac97 * ac97);
 int patch_ad1819(struct snd_ac97 * ac97);
 int patch_ad1881(struct snd_ac97 * ac97);
 int patch_ad1885(struct snd_ac97 * ac97);