[PATCH V2] ALSA: realtek/alc288 fix headphone for MS Surface 2/3

[PATCH V2] ALSA: realtek/alc288 fix headphone for MS Surface 2/3

[René Rebe]

The Surface Pro 2 and 3 have a strange headphone frequency response
and miss most of the bass. I discovered connecting the HP out to the
main DAC fixes this. Maybe the other is mono or intentionally filtered
signal for the built-in speakers? (At least the Lenovo Ideapad 720S
(AMD) (0x17aa, 0x3812) exhibited the same problem, but I don't have it
anymore for testing V2 changes.)

Signed-off-by: René Rebe <rene@exactco.de>
Co-developed-by: Takashi Iwai <tiwai@suse.com>
---
V2: use preferred_pairs instead of directly writing verbs
---
 sound/hda/codecs/realtek/alc269.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c
index 1aa4fef8acf6..46f40f38b6f5 100644
--- a/sound/hda/codecs/realtek/alc269.c
+++ b/sound/hda/codecs/realtek/alc269.c
@@ -3453,6 +3453,21 @@ static void alc283_fixup_dell_hp_resume(struct hda_codec *codec,
 		alc_write_coef_idx(codec, 0xd, 0x2800);
 }
 
+/* Swap DAC assignments for HP and speaker */
+static void alc288_fixup_surface_swap_dacs(struct hda_codec *codec,
+					   const struct hda_fixup *fix, int action)
+{
+	struct alc_spec *spec = codec->spec;
+	static hda_nid_t preferred_pairs[] = {
+		0x21, 0x03, 0x14, 0x02, 0
+	};
+
+	if (action != HDA_FIXUP_ACT_PRE_PROBE)
+		return;
+
+	spec->gen.preferred_dacs = preferred_pairs;
+}
+
 enum {
 	ALC269_FIXUP_GPIO2,
 	ALC269_FIXUP_SONY_VAIO,
@@ -3774,6 +3789,7 @@ enum {
 	ALC256_FIXUP_VAIO_RPL_MIC_NO_PRESENCE,
 	ALC245_FIXUP_HP_TAS2781_SPI_MUTE_LED,
 	ALC245_FIXUP_HP_TAS2781_I2C_MUTE_LED,
+	ALC288_FIXUP_SURFACE_SWAP_DACS,
 };
 
 /* A special fixup for Lenovo C940 and Yoga Duet 7;
@@ -6229,6 +6245,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc245_tas2781_i2c_hp_fixup_muteled,
 	},
+	[ALC288_FIXUP_SURFACE_SWAP_DACS] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc288_fixup_surface_swap_dacs,
+	},
 };
 
 static const struct hda_quirk alc269_fixup_tbl[] = {
@@ -6929,6 +6950,7 @@ static const struct hda_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x10ec, 0x12cc, "Intel Reference board", ALC295_FIXUP_CHROME_BOOK),
 	SND_PCI_QUIRK(0x10ec, 0x12f6, "Intel Reference board", ALC295_FIXUP_CHROME_BOOK),
 	SND_PCI_QUIRK(0x10f7, 0x8338, "Panasonic CF-SZ6", ALC269_FIXUP_ASPIRE_HEADSET_MIC),
+	SND_PCI_QUIRK(0x1414, 0x9c20, "Microsoft Surface Pro 2/3", ALC288_FIXUP_SURFACE_SWAP_DACS),
 	SND_PCI_QUIRK(0x144d, 0xc109, "Samsung Ativ book 9 (NP900X3G)", ALC269_FIXUP_INV_DMIC),
 	SND_PCI_QUIRK(0x144d, 0xc169, "Samsung Notebook 9 Pen (NP930SBE-K01US)", ALC298_FIXUP_SAMSUNG_AMP),
 	SND_PCI_QUIRK(0x144d, 0xc176, "Samsung Notebook 9 Pro (NP930MBE-K04US)", ALC298_FIXUP_SAMSUNG_AMP),
-- 
2.46.0

-- 
René Rebe, ExactCODE GmbH, Berlin, Germany
https://exactco.de • https://t2linux.com • https://patreon.com/renerebe

Re: [PATCH V2] ALSA: realtek/alc288 fix headphone for MS Surface 2/3

[Takashi Iwai]

On Thu, 20 Nov 2025 12:42:40 +0100,
René Rebe wrote:
> 
> The Surface Pro 2 and 3 have a strange headphone frequency response
> and miss most of the bass. I discovered connecting the HP out to the
> main DAC fixes this. Maybe the other is mono or intentionally filtered
> signal for the built-in speakers? (At least the Lenovo Ideapad 720S
> (AMD) (0x17aa, 0x3812) exhibited the same problem, but I don't have it
> anymore for testing V2 changes.)
> 
> Signed-off-by: René Rebe <rene@exactco.de>
> Co-developed-by: Takashi Iwai <tiwai@suse.com>
> ---
> V2: use preferred_pairs instead of directly writing verbs

Applied now.  Thanks.


Takashi