ALSA: hda - Disable AA-loopback on ALC283 Chromebook

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@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 894703532ab7fdff1a400b67d322920f8c7c304f..c516fa93ee63288542d346902fdd68bc91c0e33d 100644 (file)
--- 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 */