[3.5.y.z extended stable] Patch "ALSA: hda/realtek - Avoid invalid COEFs for ALC271X" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ALSA: hda/realtek - Avoid invalid COEFs for ALC271X

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From fac0ed083f15237f43274d702c4fe82992fb9e97 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai at suse.de>
Date: Mon, 3 Feb 2014 09:56:13 +0100
Subject: ALSA: hda/realtek - Avoid invalid COEFs for ALC271X

commit d3c56568f43807135f2c2a09582a69f809f0d8b7 upstream.

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
stall.

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
Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 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 9df1421..21bc6d6 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -6164,6 +6164,9 @@ static void alc269_fill_coef(struct hda_codec *codec)

 	if (spec->codec_variant != ALC269_TYPE_ALC269VB)
 		return;
+	/* 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);
--
1.8.3.2