ALSA: hda - Fix headset mic input after muted internal mic (Dell/Realtek)

commit d59915d0655c5864b514f21daaeac98c047875dc upstream.

By trial and error, I found this patch could work around an issue
where the headset mic would stop working if you switch between the
internal mic and the headset mic, and the internal mic was muted.

It still takes a second or two before the headset mic actually starts
working, but still better than nothing.

Information update from Kailang:
  The verb was ADC digital mute(bit 6 default 1).
  Switch internal mic and headset mic will run alc_headset_mode_default.
  The coef index 0x11 will set to 0x0041.
  Because headset mode was fixed type. It doesn't need to run
  alc_determine_headset_type.
  So, the value still keep 0x0041. ADC was muted.

BugLink: https://bugs.launchpad.net/bugs/1256840
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index db5168555a14f4a92878493d5a47115313ec4927..a7605db321a41099e2aa40d2a7b0d8a485eb7e99 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3041,6 +3041,7 @@ static void alc_headset_mode_ctia(struct hda_codec *codec)
                alc_write_coef_idx(codec, 0x18, 0x7388);
                break;
        case 0x10ec0668:
+               alc_write_coef_idx(codec, 0x11, 0x0001);
                alc_write_coef_idx(codec, 0x15, 0x0d60);
                alc_write_coef_idx(codec, 0xc3, 0x0000);
                break;
@@ -3063,6 +3064,7 @@ static void alc_headset_mode_omtp(struct hda_codec *codec)
                alc_write_coef_idx(codec, 0x18, 0x7388);
                break;
        case 0x10ec0668:
+               alc_write_coef_idx(codec, 0x11, 0x0001);
                alc_write_coef_idx(codec, 0x15, 0x0d50);
                alc_write_coef_idx(codec, 0xc3, 0x0000);
                break;