3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <ti...@suse.de>

commit 16c0cefe8951b2c4b824fd06011ac1b359b1ab3b upstream.

When the hp mic pin has no VREF bits, the driver forgot to set PIN_IN
bit.  Spotted during debugging old MacBook Airs.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=65681
Signed-off-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 sound/pci/hda/hda_generic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -2764,7 +2764,7 @@ static int hp_mic_jack_mode_put(struct s
                        val &= ~(AC_PINCTL_VREFEN | PIN_HP);
                        val |= get_vref_idx(vref_caps, idx) | PIN_IN;
                } else
-                       val = snd_hda_get_default_vref(codec, nid);
+                       val = snd_hda_get_default_vref(codec, nid) | PIN_IN;
        }
        snd_hda_set_pin_ctl_cache(codec, nid, val);
        call_hp_automute(codec, NULL);


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