Add a model/fixup string "lenovo-dock", for Thinkpad T431s, to allow sound in 
docking station.

Tested on Lenovo T431s with ThinkPad Mini Dock Plus Series 3

Signed-off-by: Ebben Aries <ear...@dscp.org>
---
 sound/pci/hda/patch_realtek.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 59d2e91..9658faf 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3530,6 +3530,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
        SND_PCI_QUIRK(0x17aa, 0x21fa, "Thinkpad X230", 
ALC269_FIXUP_LENOVO_DOCK),
        SND_PCI_QUIRK(0x17aa, 0x21f3, "Thinkpad T430", 
ALC269_FIXUP_LENOVO_DOCK),
        SND_PCI_QUIRK(0x17aa, 0x21fb, "Thinkpad T430s", 
ALC269_FIXUP_LENOVO_DOCK),
+       SND_PCI_QUIRK(0x17aa, 0x2208, "Thinkpad T431s", 
ALC269_FIXUP_LENOVO_DOCK),
        SND_PCI_QUIRK(0x17aa, 0x2203, "Thinkpad X230 Tablet", 
ALC269_FIXUP_LENOVO_DOCK),
        SND_PCI_QUIRK(0x17aa, 0x3bf8, "Quanta FL1", ALC269_FIXUP_PCM_44K),
        SND_PCI_QUIRK(0x17aa, 0x9e54, "LENOVO NB", ALC269_FIXUP_LENOVO_EAPD),
-- 
1.7.12.1

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