Onboard sound not detected for Zenith ROG after upgrade to 20.04

[sohail]

After upgrading to 20.04, my onboard sound no longer seems to work. The motherboard is ROG Zenith. dmesg shows the following:

[ 9.266092] snd_hda_intel 0000:09:00.1: dmic_detect option is deprecated, pass snd-intel-dspcfg.dsp_driver=1 option instead
[ 9.266556] snd_hda_intel 0000:09:00.1: Disabling MSI
[ 9.266586] snd_hda_intel 0000:09:00.1: Handle vga_switcheroo audio client
[ 9.267181] snd_hda_intel 0000:0b:00.3: Skipping the blacklisted device

After searching for this message in kernel source, I happened upon this line:

https://github.com/torvalds/linux/blob/052c467cb58748e302a95546925928e637025acc/sound/pci/hda/hda_intel.c#L2082

static const struct pci_device_id driver_blacklist[] = {
 { PCI_DEVICE_SUB(0x1022, 0x1487, 0x1043, 0x874f) }, /* ASUS ROG Zenith II / Strix */
 { PCI_DEVICE_SUB(0x1022, 0x1487, 0x1462, 0xcb59) }, /* MSI TRX40 Creator */
 { PCI_DEVICE_SUB(0x1022, 0x1487, 0x1462, 0xcb60) }, /* MSI TRX40 */
 {}
};

Which led me to this bug report:

https://<email address hidden>/

I confirmed that the PCI device that is not working appears to match the vendor ID:

$ lspci | grep 0b:00.3
0b:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) HD Audio Controller

$ lspci -n | grep 0b:00.3
0b:00.3 0403: 1022:1457

Unfortunately, I am unsure how to test a Ubuntu compatible kernel with these changes but it appears there has been some jiggery pokery in Linux kernel land in this regard.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
NonfreeKernelModules: wl nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sohail 4693 F.... pulseaudio
 /dev/snd/pcmC1D0p: sohail 4693 F...m pulseaudio
 /dev/snd/controlC0: sohail 4693 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun May 31 11:14:39 2020
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-07-16 (1049 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: Upgraded to focal on 2020-05-24 (6 days ago)
dmi.bios.date: 07/16/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1304
dmi.board.asset.tag: Default string
dmi.board.name: ROG ZENITH EXTREME
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1304:bd07/16/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGZENITHEXTREME:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[sohail (launchpad-taggedtype)]

Upgrading to Linux kernel 5.6.15 via the script here does the job:

https://github.com/pimlie/ubuntu-mainline-kernel.sh

Is there a way to find out which kernel has the above bug fix and the least diffs from the Ubuntu 20.04 kernel?