[Bug 285156] No HDMI audio on AlderLake N100

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285156

--- Comment #7 from Jonathan Chen <jonc@chen.org.nz> ---
(In reply to Stefan Roesch from comment #6)

obsidian:~,10:19pm# cat /dev/sndstat
Installed devices:
pcm0: <CSCTEK USB Audio and HID> (play/rec) default
No devices installed from userspace.
obsidian:~,10:20pm# sysctl dev.hdac
dev.hdac.0.polling: 0
dev.hdac.0.pindump: 0
dev.hdac.0.wake: 0
dev.hdac.0.%iommu: rid=0xfb
dev.hdac.0.%parent: pci0
dev.hdac.0.%pnpinfo: vendor=0x8086 device=0x54c8 subvendor=0x8086
subdevice=0x7270 class=0x040300
dev.hdac.0.%location: slot=31 function=3 dbsf=pci0:0:31:3
handle=\_SB_.PC00.HDAS
dev.hdac.0.%driver: hdac
dev.hdac.0.%desc: Intel Alder Lake-N HDA Controller
dev.hdac.%parent:
obsidian:~,10:22pm# pciconf -lv
hostb0@pci0:0:0:0:      class=0x060000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x461c subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N Processor Host Bridge/DRAM Registers'
    class      = bridge
    subclass   = HOST-PCI
vgapci0@pci0:0:2:0:     class=0x030000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x46d4 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N [Intel Graphics]'
    class      = display
    subclass   = VGA
xhci0@pci0:0:20:0:      class=0x0c0330 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54ed subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCH USB 3.2 Gen 2x1 (10 Gb/s) xHCI Host
Controller'
    class      = serial bus
    subclass   = USB
none0@pci0:0:20:2:      class=0x050000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54ef subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCH Shared SRAM'
    class      = memory
    subclass   = RAM
none1@pci0:0:22:0:      class=0x078000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54e0 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCH HECI Controller'
    class      = simple comms
ahci0@pci0:0:23:0:      class=0x010601 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54d3 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N SATA AHCI Controller'
    class      = mass storage
    subclass   = SATA
ig4iic0@pci0:0:25:0:    class=0x0c8000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54c5 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N I2C Controller'
    class      = serial bus
ig4iic1@pci0:0:25:1:    class=0x0c8000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54c6 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N I2C Controller'
    class      = serial bus
sdhci_pci0@pci0:0:26:0: class=0x080501 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54c4 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N eMMC Controller'
    class      = base peripheral
    subclass   = SD host controller
pcib1@pci0:0:28:0:      class=0x060400 rev=0x00 hdr=0x01 vendor=0x8086
device=0x54be subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
pcib2@pci0:0:29:0:      class=0x060400 rev=0x00 hdr=0x01 vendor=0x8086
device=0x54b0 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
isab0@pci0:0:31:0:      class=0x060100 rev=0x00 hdr=0x00 vendor=0x8086
device=0x5481 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCH eSPI Controller'
    class      = bridge
    subclass   = PCI-ISA
hdac0@pci0:0:31:3:      class=0x040300 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54c8 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N PCH High Definition Audio Controller'
    class      = multimedia
    subclass   = HDA
ichsmb0@pci0:0:31:4:    class=0x0c0500 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54a3 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N SMBus'
    class      = serial bus
    subclass   = SMBus
none2@pci0:0:31:5:      class=0x0c8000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x54a4 subvendor=0x8086 subdevice=0x7270
    vendor     = 'Intel Corporation'
    device     = 'Alder Lake-N SPI (flash) Controller'
    class      = serial bus
re0@pci0:1:0:0: class=0x020000 rev=0x15 hdr=0x00 vendor=0x10ec device=0x8168
subvendor=0x10ec subdevice=0x0123
    vendor     = 'Realtek Semiconductor Co., Ltd.'
    device     = 'RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
Controller'
    class      = network
    subclass   = ethernet
rtw880@pci0:2:0:0:      class=0x028000 rev=0x00 hdr=0x00 vendor=0x10ec
device=0xc821 subvendor=0x10ec subdevice=0xc821
    vendor     = 'Realtek Semiconductor Co., Ltd.'
    device     = 'RTL8821CE 802.11ac PCIe Wireless Network Adapter'
    class      = network

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