The patch below does not apply to the 3.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 3a6c5d8ad0a9253aafb76df3577edcb68c09b939 Mon Sep 17 00:00:00 2001
From: Hui Wang <[email protected]>
Date: Wed, 18 Dec 2013 18:09:56 +0800
Subject: [PATCH] ALSA: hda - Add Dell headset detection quirk for one more
 laptop model

On the Dell machines with codec whose Subsystem Id is 0x10280640,
no external microphone can be detected when plugging a 3-ring headset.
Using ALC255_FIXUP_DELL1_MIC_NO_PRESENCE can fix this problem.

The codec (Vendor ID: 0x10ec0255) on the machine belongs to alc_269
family.

BugLink: https://bugs.launchpad.net/bugs/1260303
Cc: David Henningsson <[email protected]>
Cc: [email protected]
Signed-off-by: Hui Wang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 5ab8e1631190..c5646941539a 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4256,6 +4256,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
        SND_PCI_QUIRK(0x1028, 0x0638, "Dell Inspiron 5439", 
ALC290_FIXUP_MONO_SPEAKERS),
        SND_PCI_QUIRK(0x1028, 0x063e, "Dell", 
ALC269_FIXUP_DELL1_MIC_NO_PRESENCE),
        SND_PCI_QUIRK(0x1028, 0x063f, "Dell", 
ALC255_FIXUP_DELL1_MIC_NO_PRESENCE),
+       SND_PCI_QUIRK(0x1028, 0x0640, "Dell", 
ALC255_FIXUP_DELL1_MIC_NO_PRESENCE),
        SND_PCI_QUIRK(0x1028, 0x15cc, "Dell X5 Precision", 
ALC269_FIXUP_DELL2_MIC_NO_PRESENCE),
        SND_PCI_QUIRK(0x1028, 0x15cd, "Dell X5 Precision", 
ALC269_FIXUP_DELL2_MIC_NO_PRESENCE),
        SND_PCI_QUIRK(0x103c, 0x1586, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC2),

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