[alsa-devel] [PATCH] ALSA: hda/realtek - Avoid invalid COEFs for ALC271X

Takashi Iwai tiwai at suse.de
Wed Feb 5 07:19:00 CET 2014

We've seen often problems after suspend/resume on Acer Aspire One
AO725 with ALC271X codec as reported in kernel bugzilla, and it turned
out that some COEFs doesn't work and triggers the codec communication

Since these magic COEF setups are specific to ALC269VB for some PLL
configurations, the machine works even without these manual
adjustment.  So, let's simply avoid applying them for ALC271X.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=52181
Cc: <stable at vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
 sound/pci/hda/patch_realtek.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 56a8f1876603..e16a71e586f0 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4427,6 +4427,9 @@ static void alc269_fill_coef(struct hda_codec *codec)
 	if (spec->codec_variant != ALC269_TYPE_ALC269VB)
+	/* ALC271X doesn't seem to support these COEFs (bko#52181) */
+	if (!strcmp(codec->chip_name, "ALC271X"))
+		return;
 	if ((alc_get_coef0(codec) & 0x00ff) < 0x015) {
 		alc_write_coef_idx(codec, 0xf, 0x960b);

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