[Bug 1834771] Re: No HDMI-audio after kernel 4.15.-0.50

@Gerry, it's clear from your aplay list that the kernel doesn't see the
HDMI audio hardware. Mine, for example, shows:

card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]

So it appears you need TWO workarounds; the second is ready to go but
the requirement of the first is to make the kernel aware of your HDMI
audio hardware.

Perhaps this bug encompasses both needs...or maybe just one...or the
other...aaiiii! This is what makes sorting through all the relevant
online info so difficult.

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Title:
No HDMI-audio after kernel 4.15.-0.50

Status in linux package in Ubuntu:
Confirmed

Bug description:
I've got no HDMI-audio. Latest kernel with working HDMI-audio is 4.15.-0.50. In pavucontrol HDMI-audio shows unplugged. And also internal audio shows unplugged, but it still works. I'm on linux mint 18.3.
---
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jouni 1859 F.... pulseaudio
/dev/snd/controlC1: jouni 1859 F.... pulseaudio
CurrentDesktop: X-Cinnamon
DistroRelease: Linux 18.3
HibernationDevice: RESUME=UUID=9e8d7bf3-dc5f-4c72-b875-6dbe81a36c36
InstallationDate: Installed on 2017-01-28 (883 days ago)
InstallationMedia: Linux Mint 18.1 "Serena" - Release amd64 20161213
IwConfig:
lo no wireless extensions.

enp3s0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
Package: linux (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-54-generic root=UUID=f167a2b0-3b30-4a5a-907f-6b97c95b7a91 ro quiet iommu=soft splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.15.0-54.58~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-54-generic N/A
linux-backports-modules-4.15.0-54-generic N/A
linux-firmware 1.157.21
RfKill:

Tags: sylvia
Uname: Linux 4.15.0-54-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo video
_MarkForUpload: True
dmi.bios.date: 02/26/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: FC
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 970A-UD3P
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFC:bd02/26/2016:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn970A-UD3P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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