The HP EliteBook 840 G8 seems to be circulating with different
subsystem-IDs. alsa-info.sh showed on my box:
!!DMI Information
!!---------------
Manufacturer: HP
Product Name: HP EliteBook 840 G8 Notebook PC
Product Version: SBKPF
Firmware Version: T37 Ver. 01.15.02
System SKU: 5S7R6EC#ABD
Board Vendor: HP
Board Name: 8AB8
...
!!HDA-Intel Codec information
!!---------------------------
--startcollapse--
Codec: Realtek ALC285
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x10ec0285
Subsystem Id: 0x103c8ab9
Revision Id: 0x100002
So an additional quirk enabled mute led for me:
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -9752,6 +9752,7 @@
SND_PCI_QUIRK(0x103c, 0x8aa3, "HP ProBook 450 G9 (MB 8AA1)",
ALC236_FIXUP_HP_GPIO_LED),
SND_PCI_QUIRK(0x103c, 0x8aa8, "HP EliteBook 640 G9 (MB 8AA6)",
ALC236_FIXUP_HP_GPIO_LED),
SND_PCI_QUIRK(0x103c, 0x8aab, "HP EliteBook 650 G9 (MB 8AA9)",
ALC236_FIXUP_HP_GPIO_LED),
+ SND_PCI_QUIRK(0x103c, 0x8ab9, "HP EliteBook 840 G8 (MB 8AB8)",
ALC285_FIXUP_HP_GPIO_LED),
SND_PCI_QUIRK(0x103c, 0x8abb, "HP ZBook Firefly 14 G9",
ALC245_FIXUP_CS35L41_SPI_2_HP_GPIO_LED),
SND_PCI_QUIRK(0x103c, 0x8ad1, "HP EliteBook 840 14 inch G9 Notebook
PC", ALC245_FIXUP_CS35L41_SPI_2_HP_GPIO_LED),
SND_PCI_QUIRK(0x103c, 0x8ad2, "HP EliteBook 860 16 inch G9 Notebook
PC", ALC245_FIXUP_CS35L41_SPI_2_HP_GPIO_LED),
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