Fixed Headphone noise issue for Dell QCM1255

Fixed Headphone noise issue for Dell QCM1255

[Kailang]

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Hi Takashi,

This platform booted with Ubuntu 24.04 with Pipewire audio server. So, it has pop
noise with headphone. But it's normal with Pulseaudio server.
This patch was the workaround. Connect the headphones to DAC 0x2.
The popping sound will disappear.

This solution was approved by Dell.

Thanks.
Kailang

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From dab8c17097eac38e0d9aae63a2f7e1860257e8d6 Mon Sep 17 00:00:00 2001
From: Kailang Yang <kailang@realtek.com>
Date: Thu, 9 Jul 2026 14:57:06 +0800
Subject: [PATCH] ALSA: hda/realtek - Fixed Headphone noise issue for Dell QCM1255

This platform booted with Ubuntu 24.04 with Pipewire audio server. So, it has pop
noise with headphone. But it's normal with Pulseaudio server.
This patch was the workaround. Connect the headphones to DAC 0x2.
The popping sound will disappear.

Signed-off-by: Kailang Yang <kailang@realtek.com>

diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c
index 5b22cd941026..a945a95450fc 100644
--- a/sound/hda/codecs/realtek/alc269.c
+++ b/sound/hda/codecs/realtek/alc269.c
@@ -4177,6 +4177,7 @@ enum {
 	ALC256_FIXUP_HONOR_MRB_XXX_M1020_AUDIO,
 	ALC245_FIXUP_HP_ENVY_X360_15_FH0XXX,
 	ALC287_FIXUP_ACER_MICMUTE_LED,
+	ALC236_FIXUP_DELL_HP_POP_NOISE,
 };
 
 /* A special fixup for Lenovo C940 and Yoga Duet 7;
@@ -6798,6 +6799,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC2XX_FIXUP_HEADSET_MIC,
 	},
+	[ALC236_FIXUP_DELL_HP_POP_NOISE] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc285_fixup_invalidate_dacs,
+	},
 };
 
 static const struct hda_quirk alc269_fixup_tbl[] = {
@@ -6949,6 +6954,8 @@ static const struct hda_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1028, 0x0cc3, "Dell Oasis 14 Low Weight MTL-U", ALC289_FIXUP_DELL_CS35L41_SPI_2),
 	SND_PCI_QUIRK(0x1028, 0x0cc4, "Dell Oasis 16 MTL-H/U", ALC289_FIXUP_DELL_CS35L41_SPI_2),
 	SND_PCI_QUIRK(0x1028, 0x0cc5, "Dell Oasis 14", ALC289_FIXUP_RTK_AMP_DUAL_SPK),
+	SND_PCI_QUIRK(0x1028, 0x0e6b, "Dell Pro QCM1255", ALC236_FIXUP_DELL_HP_POP_NOISE),
+	SND_PCI_QUIRK(0x1028, 0x0e6d, "Dell Pro Micro QCM1255", ALC236_FIXUP_DELL_HP_POP_NOISE),
 	SND_PCI_QUIRK(0x1028, 0x164a, "Dell", ALC293_FIXUP_DELL1_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1028, 0x164b, "Dell", ALC293_FIXUP_DELL1_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x103c, 0x1586, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC2),

Re: Fixed Headphone noise issue for Dell QCM1255

[Takashi Iwai]

On Thu, 09 Jul 2026 09:27:14 +0200,
Kailang wrote:
> 
> Hi Takashi,
> 
> This platform booted with Ubuntu 24.04 with Pipewire audio server. So, it has pop
> noise with headphone. But it's normal with Pulseaudio server.
> This patch was the workaround. Connect the headphones to DAC 0x2.
> The popping sound will disappear.
> 
> This solution was approved by Dell.
> 
> Thanks.
> Kailang

Applied now.  Thanks.


Takashi