[PATCH] ALSA: hda/realtek: Fix the Dell XPS 8940 headset microphone

[PATCH] ALSA: hda/realtek: Fix the Dell XPS 8940 headset microphone

[Angel J]

The Dell XPS 8940 (1028:09c5) has an ALC3861 codec (0x10ec0899).
Its BIOS marks the headset microphone pin at NID 0x19 as disconnected
(0x411111f0). With no external microphone input in the pin configuration,
the generic parser creates a shared headphone/mic input on NID 0x1b
instead. Headphone playback works, but the headset microphone is silent.

Override NID 0x19 as a front microphone without independent presence
detection. This gives the generic parser the dedicated microphone
input and preserves NID 0x1b for simultaneous headphone playback.

I encountered this issue on my XPS 8940. Similar symptoms were also
reported by a user on Ubuntu:
https://bugs.launchpad.net/bugs/1971232

Cc: stable@vger.kernel.org
Assisted-by: Codex (GPT-6.1 Sol)
Signed-off-by: Angel J <iamanaws@httpd.dev>
---

Notes:
    Build-tested alc882.o with x86_64 defconfig, GCC 16.2.0 and W=1
    without warnings. The patch also applies to upstream v6.18.

    Boot-tested on a Dell XPS 8940 running Linux 6.18.58.
    Microphone capture and headphone playback work simultaneously.

 sound/hda/codecs/realtek/alc882.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sound/hda/codecs/realtek/alc882.c b/sound/hda/codecs/realtek/alc882.c
index 800c3d6f5..cf8d3c48e 100644
--- a/sound/hda/codecs/realtek/alc882.c
+++ b/sound/hda/codecs/realtek/alc882.c
@@ -50,6 +50,7 @@ enum {
 	ALC889_FIXUP_MP41_VREF,
 	ALC882_FIXUP_INV_DMIC,
 	ALC882_FIXUP_NO_PRIMARY_HP,
+	ALC898_FIXUP_DELL_XPS8940_MIC,
 	ALC887_FIXUP_ASUS_BASS,
 	ALC887_FIXUP_BASS_CHMAP,
 	ALC1220_FIXUP_GB_DUAL_CODECS,
@@ -507,6 +508,13 @@ static const struct hda_fixup alc882_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc882_fixup_no_primary_hp,
 	},
+	[ALC898_FIXUP_DELL_XPS8940_MIC] = {
+		.type = HDA_FIXUP_PINS,
+		.v.pins = (const struct hda_pintbl[]) {
+			{ 0x19, 0x02a19130 }, /* headset mic, no separate jack detect */
+			{}
+		},
+	},
 	[ALC887_FIXUP_ASUS_BASS] = {
 		.type = HDA_FIXUP_PINS,
 		.v.pins = (const struct hda_pintbl[]) {
@@ -610,6 +618,8 @@ static const struct hda_quirk alc882_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1025, 0x0259, "Acer Aspire 5935", ALC889_FIXUP_DAC_ROUTE),
 	SND_PCI_QUIRK(0x1025, 0x026b, "Acer Aspire 8940G", ALC882_FIXUP_ACER_ASPIRE_8930G),
 	SND_PCI_QUIRK(0x1025, 0x0296, "Acer Aspire 7736z", ALC882_FIXUP_ACER_ASPIRE_7736),
+	SND_PCI_QUIRK(0x1028, 0x09c5, "Dell XPS 8940",
+		      ALC898_FIXUP_DELL_XPS8940_MIC),
 	SND_PCI_QUIRK(0x1043, 0x13c2, "Asus A7M", ALC882_FIXUP_EAPD),
 	SND_PCI_QUIRK(0x1043, 0x1873, "ASUS W90V", ALC882_FIXUP_ASUS_W90V),
 	SND_PCI_QUIRK(0x1043, 0x1971, "Asus W2JC", ALC882_FIXUP_ASUS_W2JC),

base-commit: a4311e9447bbb219044db38897f95be112f46a8a

Re: [PATCH] ALSA: hda/realtek: Fix the Dell XPS 8940 headset microphone

[Takashi Iwai]

On Tue, 03 Nov 2026 16:03:36 +0100,
Angel J wrote:
> 
> The Dell XPS 8940 (1028:09c5) has an ALC3861 codec (0x10ec0899).
> Its BIOS marks the headset microphone pin at NID 0x19 as disconnected
> (0x411111f0). With no external microphone input in the pin configuration,
> the generic parser creates a shared headphone/mic input on NID 0x1b
> instead. Headphone playback works, but the headset microphone is silent.
> 
> Override NID 0x19 as a front microphone without independent presence
> detection. This gives the generic parser the dedicated microphone
> input and preserves NID 0x1b for simultaneous headphone playback.
> 
> I encountered this issue on my XPS 8940. Similar symptoms were also
> reported by a user on Ubuntu:
> https://bugs.launchpad.net/bugs/1971232
> 
> Cc: stable@vger.kernel.org
> Assisted-by: Codex (GPT-6.1 Sol)
> Signed-off-by: Angel J <iamanaws@httpd.dev>

The code change looks OK, but could you resubmit with a proper
Signed-off-by tag with your full name (also From tag, too)?
Signed-off-by is a legal requirement.


thanks,

Takashi

Re: [PATCH] ALSA: hda/realtek: Fix the Dell XPS 8940 headset microphone

[Angel J]

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On Tuesday, November 3rd, 2026 at 23:15, Takashi Iwai <tiwai@suse.de> wrote:
> The code change looks OK, but could you resubmit with a proper
> Signed-off-by tag with your full name (also From tag, too)?
> Signed-off-by is a legal requirement.

Hi Takashi,

Thanks for reviewing. My understanding is that the guidelines require
a known identity, without necessarily requiring disclosure of a full
name. I consistently use “Angel J” and this email address for kernel
contributions. My PCI fix, commit 8805840aad73, was merged with the same
author identity and Signed-off-by.

Is there an additional requirement for this submission that I’m missing?

Thanks,
Angel J

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Re: [PATCH] ALSA: hda/realtek: Fix the Dell XPS 8940 headset microphone

[Takashi Iwai]

On Mon, 09 Nov 2026 18:58:47 +0100,
Angel J wrote:
> 
> On Tuesday, November 3rd, 2026 at 23:15, Takashi Iwai <tiwai@suse.de> wrote:
> > The code change looks OK, but could you resubmit with a proper
> > Signed-off-by tag with your full name (also From tag, too)?
> > Signed-off-by is a legal requirement.
> 
> Hi Takashi,
> 
> Thanks for reviewing. My understanding is that the guidelines require
> a known identity, without necessarily requiring disclosure of a full
> name. I consistently use “Angel J” and this email address for kernel
> contributions. My PCI fix, commit 8805840aad73, was merged with the same
> author identity and Signed-off-by.

Is your identity really already widely known in the kernel community?
I see only one recent commit in the past, and I can't see it's really
"known".


thanks,

Takashi