From de9481cb40339d9bfc1104b53649876fc5f3d432 Mon Sep 17 00:00:00 2001
From: Kailang Yang <kailang@realtek.com>
Date: Mon, 7 Apr 2014 16:41:52 +0800
Subject: ALSA: hda/realtek - Improve HP depop when system change power state
 on Chromebook

It is better to change Mic2-Vref to manual mode.
Manual control Mic2-Vref will solve pop noise issue.
It will improve pop noise for power on, power off, S3 and resume.

Signed-off-by: Kailang Yang <kailang@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 0531077..ca1298a 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4005,6 +4005,10 @@ static void alc283_fixup_chromebook(struct hda_codec *codec,
 		spec->gen.mixer_nid = 0;
 		break;
 	case HDA_FIXUP_ACT_INIT:
+		/* MIC2-VREF control */
+		/* Set to manual mode */
+		val = alc_read_coef_idx(codec, 0x06);
+		alc_write_coef_idx(codec, 0x06, val & ~0x000c);
 		/* Enable Line1 input control by verb */
 		val = alc_read_coef_idx(codec, 0x1a);
 		alc_write_coef_idx(codec, 0x1a, val | (1 << 4));
-- 
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