This is a note to let you know that I've just added the patch titled
ALSA: hda/realtek: reset eapd coeff to default value for alc287
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-hda-realtek-reset-eapd-coeff-to-default-value-for-alc287.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8822702f6e4c8917c83ba79e0ebf2c8c218910d4 Mon Sep 17 00:00:00 2001
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Date: Fri, 7 May 2021 10:44:52 +0800
Subject: ALSA: hda/realtek: reset eapd coeff to default value for alc287
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
commit 8822702f6e4c8917c83ba79e0ebf2c8c218910d4 upstream.
Ubuntu users reported an audio bug on the Lenovo Yoga Slim 7 14IIL05,
he installed dual OS (Windows + Linux), if he booted to the Linux
from Windows, the Speaker can't work well, it has crackling noise,
if he poweroff the machine first after Windows, the Speaker worked
well.
Before rebooting or shutdown from Windows, the Windows changes the
codec eapd coeff value, but the BIOS doesn't re-initialize its value,
when booting into the Linux from Windows, the eapd coeff value is not
correct. To fix it, set the codec default value to that coeff register
in the alsa driver.
BugLink: http://bugs.launchpad.net/bugs/1925057
Suggested-by: Kailang Yang <kailang@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210507024452.8300-1-hui.wang@xxxxxxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/patch_realtek.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -388,7 +388,6 @@ static void alc_fill_eapd_coef(struct hd
case 0x10ec0282:
case 0x10ec0283:
case 0x10ec0286:
- case 0x10ec0287:
case 0x10ec0288:
case 0x10ec0285:
case 0x10ec0298:
@@ -399,6 +398,10 @@ static void alc_fill_eapd_coef(struct hd
case 0x10ec0275:
alc_update_coef_idx(codec, 0xe, 0, 1<<0);
break;
+ case 0x10ec0287:
+ alc_update_coef_idx(codec, 0x10, 1<<9, 0);
+ alc_write_coef_idx(codec, 0x8, 0x4ab7);
+ break;
case 0x10ec0293:
alc_update_coef_idx(codec, 0xa, 1<<13, 0);
break;
Patches currently in stable-queue which might be from hui.wang@xxxxxxxxxxxxx are
queue-4.19/alsa-hda-realtek-reset-eapd-coeff-to-default-value-for-alc287.patch
