diff -Naur linux-source-4.15.0-orig/sound/pci/hda/patch_realtek.c linux-source-4.15.0/sound/pci/hda/patch_realtek.c
--- linux-source-4.15.0-orig/sound/pci/hda/patch_realtek.c	2019-01-29 17:27:42.000000000 +0100
+++ linux-source-4.15.0/sound/pci/hda/patch_realtek.c	2019-02-24 19:38:11.315339146 +0100
@@ -3578,6 +3578,64 @@
 			    vref);
 }
 
+struct hda_alc298_mbxinit {
+	unsigned char value_0x23;
+	unsigned char value_0x25;
+};
+
+void alc298_stereo_seq(struct hda_codec *codec,
+				struct hda_alc298_mbxinit *initval, int first)
+{
+	snd_hda_codec_write(codec, 0x6, 0, 0x73e, 0x0);
+	alc_write_coef_idx(codec, 0x26, 0xb000);
+
+	if (first)
+		snd_hda_codec_write(codec, 0x21, 0, 0xf09, 0x0);
+
+	snd_hda_codec_write(codec, 0x6, 0, 0x73e, 0x80);
+	alc_write_coef_idx(codec, 0x26, 0xf000);
+	alc_write_coef_idx(codec, 0x23, initval->value_0x23);
+
+	if (initval->value_0x23 != 0x1e)
+		alc_write_coef_idx(codec, 0x25, initval->value_0x25);
+
+	snd_hda_codec_write(codec, 0x20, 0, AC_VERB_SET_COEF_INDEX, 0x26);
+	snd_hda_codec_write(codec, 0x20, 0, 0x4b0, 0x10);
+}
+
+void alc298_fixup_huawei_mbx_stereo(struct hda_codec *codec,
+					const struct hda_fixup *fix, int action)
+{
+	// Initialization magic
+	static struct hda_alc298_mbxinit dac_init[] = {
+		{0xc, 0x0}, {0xd, 0x0}, {0xe, 0x0}, {0xf, 0x0},
+		{0x10, 0x0}, {0x1a, 0x40}, {0x1b, 0x82}, {0x1c, 0x0},
+		{0x1d, 0x0}, {0x1e, 0x0}, {0x1f, 0x0},
+		{0x20, 0xc2}, {0x21, 0xc8}, {0x22, 0x26}, {0x23, 0x24},
+		{0x27, 0xff}, {0x28, 0xff}, {0x29, 0xff}, {0x2a, 0x8f},
+		{0x2b, 0x2}, {0x2c, 0x48}, {0x2d, 0x34}, {0x2e, 0x0},
+		{0x2f, 0x0},
+		{0x30, 0x0}, {0x31, 0x0}, {0x32, 0x0}, {0x33, 0x0},
+		{0x34, 0x0}, {0x35, 0x1}, {0x36, 0x93}, {0x37, 0xc},
+		{0x38, 0x0}, {0x39, 0x0}, {0x3a, 0xf8}, {0x38, 0x80},
+		{}
+	};
+	struct hda_alc298_mbxinit *seq = dac_init;
+
+	// Start
+	snd_hda_codec_write(codec, 0x6, 0, 0x73e, 0x0);
+	snd_hda_codec_write(codec, 0x6, 0, 0x73e, 0x80);
+	alc_write_coef_idx(codec, 0x26, 0xf000);
+	alc_write_coef_idx(codec, 0x22, 0x31);
+	alc_write_coef_idx(codec, 0x23, 0xb);
+	alc_write_coef_idx(codec, 0x25, 0x0);
+	snd_hda_codec_write(codec, 0x20, 0, AC_VERB_SET_COEF_INDEX, 0x26);
+	snd_hda_codec_write(codec, 0x20, 0, 0x4b0, 0x10);
+
+	for (; seq->value_0x23; seq++)
+		alc298_stereo_seq(codec, seq, seq == dac_init);
+}
+
 static void alc269_fixup_x101_headset_mic(struct hda_codec *codec,
 				     const struct hda_fixup *fix, int action)
 {
@@ -5522,6 +5580,7 @@
 	ALC274_FIXUP_DELL_AIO_LINEOUT_VERB,
 	ALC298_FIXUP_TPT470_DOCK,
 	ALC255_FIXUP_DUMMY_LINEOUT_VERB,
+	ALC298_FIXUP_HUAWEI_MBX_STEREO,
 	ALC255_FIXUP_DELL_HEADSET_MIC,
 	ALC221_FIXUP_HP_HEADSET_MIC,
 	ALC285_FIXUP_LENOVO_HEADPHONE_NOISE,
@@ -5795,6 +5854,12 @@
 		.chained = true,
 		.chain_id = ALC269_FIXUP_HEADSET_MIC
 	},
+	[ALC298_FIXUP_HUAWEI_MBX_STEREO] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc298_fixup_huawei_mbx_stereo,
+		.chained = true,
+		.chain_id = ALC255_FIXUP_DELL_WMI_MIC_MUTE_LED
+	},
 	[ALC269_FIXUP_ASUS_X101_FUNC] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc269_fixup_x101_headset_mic,
@@ -6638,6 +6703,8 @@
 	SND_PCI_QUIRK(0x17aa, 0x511f, "Thinkpad", ALC298_FIXUP_TPT470_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x3bf8, "Quanta FL1", ALC269_FIXUP_PCM_44K),
 	SND_PCI_QUIRK(0x17aa, 0x9e54, "LENOVO NB", ALC269_FIXUP_LENOVO_EAPD),
+	SND_PCI_QUIRK(0x19e5, 0x3200, "Huawei MBX", ALC298_FIXUP_HUAWEI_MBX_STEREO),
+	SND_PCI_QUIRK(0x19e5, 0x3201, "Huawei MBX", ALC298_FIXUP_HUAWEI_MBX_STEREO),
 	SND_PCI_QUIRK(0x1b7d, 0xa831, "Ordissimo EVE2 ", ALC269VB_FIXUP_ORDISSIMO_EVE2), /* Also known as Malata PC-B1303 */
 
 #if 0