The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e1e8c1fdce8b00fce08784d9d738c60ebf598ebc Mon Sep 17 00:00:00 2001

From: Kailang Yang kailang@realtek.com Date: Tue, 26 Nov 2019 17:04:23 +0800 Subject: [PATCH] ALSA: hda/realtek - Dell headphone has noise on unmute for ALC236

headphone have noise even the volume is very small. Let it fill up pcbeep hidden register to default value. The issue was gone.

Fixes: 4344aec84bd8 ("ALSA: hda/realtek - New codec support for ALC256") Fixes: 736f20a70608 ("ALSA: hda/realtek - Add support for ALC236/ALC3204") Signed-off-by: Kailang Yang kailang@realtek.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/9ae47f23a64d4e41a9c81e263cd8a250@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 d2bf70a1d2fd..9f355b2f7d7b 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -367,9 +367,7 @@ static void alc_fill_eapd_coef(struct hda_codec *codec) case 0x10ec0215: case 0x10ec0233: case 0x10ec0235: - case 0x10ec0236: case 0x10ec0255: - case 0x10ec0256: case 0x10ec0257: case 0x10ec0282: case 0x10ec0283: @@ -381,6 +379,11 @@ static void alc_fill_eapd_coef(struct hda_codec *codec) case 0x10ec0300: alc_update_coef_idx(codec, 0x10, 1<<9, 0); break; + case 0x10ec0236: + case 0x10ec0256: + alc_write_coef_idx(codec, 0x36, 0x5757); + alc_update_coef_idx(codec, 0x10, 1<<9, 0); + break; case 0x10ec0275: alc_update_coef_idx(codec, 0xe, 0, 1<<0); break;