[alsa-devel] [PATCH] ALSA: hda - Disable AA-loopback on ALC283 Chromebook

[Takashi Iwai]

ALC283-based Chromebook suffers from occasional white noise, and it
turned out that this comes from AA-loopback.  Disable this output path
by just clearing mixer_nid, then the generic parser will skip the
creation of AA-loopback path.

Reported-and-tested-by: Kailang Yang <kailang at realtek.com>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/pci/hda/patch_realtek.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 894703532ab7..c516fa93ee63 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3445,6 +3445,8 @@ static void alc283_fixup_chromebook(struct hda_codec *codec,
 	switch (action) {
 	case HDA_FIXUP_ACT_PRE_PROBE:
 		alc283_chromebook_caps(codec);
+		/* Disable AA-loopback as it causes white noise */
+		spec->gen.mixer_nid = 0;
 		spec->gen.hp_automute_hook = alc283_hp_automute_hook;
 		/* MIC2-VREF control */
 		/* Set to manual mode */
-- 
1.8.4.1