The patch below does not apply to the 3.15-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 a12137e779e17413f87026202a890f8143858259 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <[email protected]>
Date: Fri, 27 Jun 2014 12:14:35 +0200
Subject: [PATCH] ALSA: hda - Add a fixup for Thinkpad T540p

The similar fixup as T440 is needed for supporting the dock on T540.

Reported-by: Jim Minter <[email protected]>
Cc: <[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 2a8aaf04cec7..b60824e90408 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4880,6 +4880,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
        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, 0x220e, "Thinkpad T440p", 
ALC292_FIXUP_TPT440_DOCK),
+       SND_PCI_QUIRK(0x17aa, 0x2210, "Thinkpad T540p", 
ALC292_FIXUP_TPT440_DOCK),
        SND_PCI_QUIRK(0x17aa, 0x2212, "Thinkpad", 
ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
        SND_PCI_QUIRK(0x17aa, 0x2214, "Thinkpad", 
ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
        SND_PCI_QUIRK(0x17aa, 0x2215, "Thinkpad", 
ALC269_FIXUP_LIMIT_INT_MIC_BOOST),

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