[ALSA] hda: STAC927x VREF fix

Some laptops incorrectly assume the front input jack as a line in
instead of a microphone in. Which in turn disables the voltage
reference, in which non-amplified input is not possible.  This patch
enables VREF80 for the input jack.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index a074155dd8d5..4e71bbaa1954 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3344,6 +3344,9 @@ static int patch_stac927x(struct hda_codec *codec)
                 spec->mixer = stac927x_mixer;
                 break;
         case STAC_DELL_BIOS:
+                /* correct the front input jack as a mic */
+                stac92xx_set_config_reg(codec, 0x0e, 0x02a79130);
+                /* fallthru */
         case STAC_DELL_3ST:
                 /* GPIO2 High = Enable EAPD */
                 spec->gpio_mask = spec->gpio_data = 0x00000004;