[3.19.y-ckt stable] Patch "ALSA: hda - Fix noise problems on Thinkpad T440s" has been added to the 3.19.y-ckt tree

[Kamal Mostafa]

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

    ALSA: hda - Fix noise problems on Thinkpad T440s

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt13.

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

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 8e98bd6cd91829fcfb1635f18272c978af98914c Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai at suse.de>
Date: Wed, 9 Dec 2015 15:17:43 +0100
Subject: ALSA: hda - Fix noise problems on Thinkpad T440s

commit 9a811230481243f384b8036c6a558bfdbd961f78 upstream.

Lenovo Thinkpad T440s suffers from constant background noises, and it
seems to be a generic hardware issue on this model:
  https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T440s-speaker-noise/td-p/1339883

As the noise comes from the analog loopback path, disabling the path
is the easy workaround.

Also, the machine gives significant cracking noises at PM suspend.  A
workaround found by trial-and-error is to disable the shutup callback
currently used for ALC269-variant.

This patch addresses these noise issues by introducing a new fixup
chain.  Although the same workaround might be applicable to other
Thinkpad models, it's applied only to T440s (17aa:220c) in this patch,
so far, just to be safe (you chicken!).  As a compromise, a new model
option string "tp440" is provided now, though, so that owners of other
Thinkpad models can test it more easily.

Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=958504
Reported-and-tested-by: Tim Hardeck <thardeck at suse.de>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 sound/pci/hda/patch_realtek.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 1b4a7b8..1fdddc7 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4066,6 +4066,18 @@ static unsigned int alc_power_filter_xps13(struct hda_codec *codec,
 	return power_state;
 }

+/* additional fixup for Thinkpad T440s noise problem */
+static void alc_fixup_tpt440(struct hda_codec *codec,
+				  const struct hda_fixup *fix, int action)
+{
+	struct alc_spec *spec = codec->spec;
+
+	if (action == HDA_FIXUP_ACT_PRE_PROBE) {
+		spec->shutup = alc_no_shutup; /* reduce click noise */
+		spec->gen.mixer_nid = 0; /* reduce background noise */
+	}
+}
+
 static void alc_fixup_dell_xps13(struct hda_codec *codec,
 				const struct hda_fixup *fix, int action)
 {
@@ -4357,6 +4369,7 @@ enum {
 	ALC293_FIXUP_DELL1_MIC_NO_PRESENCE,
 	ALC292_FIXUP_TPT440_DOCK,
 	ALC292_FIXUP_TPT440_DOCK2,
+	ALC292_FIXUP_TPT440,
 	ALC283_FIXUP_BXBT2807_MIC,
 	ALC255_FIXUP_DELL_WMI_MIC_MUTE_LED,
 	ALC282_FIXUP_ASPIRE_V5_PINS,
@@ -4829,6 +4842,12 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC269_FIXUP_LIMIT_INT_MIC_BOOST
 	},
+	[ALC292_FIXUP_TPT440] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_tpt440,
+		.chained = true,
+		.chain_id = ALC292_FIXUP_TPT440_DOCK,
+	},
 	[ALC283_FIXUP_BXBT2807_MIC] = {
 		.type = HDA_FIXUP_PINS,
 		.v.pins = (const struct hda_pintbl[]) {
@@ -5016,7 +5035,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x17aa, 0x21fb, "Thinkpad T430s", ALC269_FIXUP_LENOVO_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x2203, "Thinkpad X230 Tablet", ALC269_FIXUP_LENOVO_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x2208, "Thinkpad T431s", ALC269_FIXUP_LENOVO_DOCK),
-	SND_PCI_QUIRK(0x17aa, 0x220c, "Thinkpad T440s", ALC292_FIXUP_TPT440_DOCK),
+	SND_PCI_QUIRK(0x17aa, 0x220c, "Thinkpad T440s", ALC292_FIXUP_TPT440),
 	SND_PCI_QUIRK(0x17aa, 0x220e, "Thinkpad T440p", ALC292_FIXUP_TPT440_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x2210, "Thinkpad T540p", ALC292_FIXUP_TPT440_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x2212, "Thinkpad T440", ALC292_FIXUP_TPT440_DOCK),
@@ -5113,6 +5132,7 @@ static const struct hda_model_fixup alc269_fixup_models[] = {
 	{.id = ALC283_FIXUP_CHROME_BOOK, .name = "alc283-dac-wcaps"},
 	{.id = ALC283_FIXUP_SENSE_COMBO_JACK, .name = "alc283-sense-combo"},
 	{.id = ALC292_FIXUP_TPT440_DOCK, .name = "tpt440-dock"},
+	{.id = ALC292_FIXUP_TPT440, .name = "tpt440"},
 	{}
 };

--
1.9.1