Same bug apparently and i have ubuntu focal kernel. In my case the next command this fix partially my problem, because my audio is set to null in sound, but i can listen it: pacmd set-card-profile 0 output:hdmi-stereo
Note i have this problem for a long time, but with ubuntu focal is worse than ever. I can not find a good permanent solution. Only in pavucontrol i can see my HDMI Audio and this is what i can see when i can lisent something: Card: RS880 HDMI Audio [Radeon HD 4200 Series] Profile: Digital Stereo (HDMI) Output (unplugged) (unavailable) Internal Audio: off pacmd list-cards 2 card(s) available. index: 0 name: <alsa_card.pci-0000_01_05.1> driver: <module-alsa-card.c> owner module: 7 properties: alsa.card = "1" alsa.card_name = "HDA ATI HDMI" alsa.long_card_name = "HDA ATI HDMI at 0xfdafc000 irq 19" alsa.driver_name = "snd_hda_intel" device.bus_path = "pci-0000:01:05.1" sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:05.1/sound/card1" device.bus = "pci" device.vendor.id = "1002" device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]" device.product.id = "970f" device.product.name = "RS880 HDMI Audio [Radeon HD 4200 Series]" device.string = "1" device.description = "RS880 HDMI Audio [Radeon HD 4200 Series]" module-udev-detect.discovered = "1" device.icon_name = "audio-card-pci" profiles: output:hdmi-stereo: Digital Stereo (HDMI) Salida (priority 5900, available: no) output:hdmi-surround: Digital Surround 5.1 (HDMI) Salida (priority 800, available: no) output:hdmi-surround71: Digital Surround 7.1 (HDMI) Salida (priority 800, available: no) off: Apagado (priority 0, available: unknown) active profile: <output:hdmi-stereo> sinks: alsa_output.pci-0000_01_05.1.hdmi-stereo/#1: RS880 HDMI Audio [Radeon HD 4200 Series] Digital Stereo (HDMI) sources: alsa_output.pci-0000_01_05.1.hdmi-stereo.monitor/#1: Monitor of RS880 HDMI Audio [Radeon HD 4200 Series] Digital Stereo (HDMI) ports: hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: no) properties: device.icon_name = "video-display" index: 1 name: <alsa_card.pci-0000_00_14.2> driver: <module-alsa-card.c> owner module: 8 properties: alsa.card = "0" alsa.card_name = "HDA ATI SB" alsa.long_card_name = "HDA ATI SB at 0xfe024000 irq 16" alsa.driver_name = "snd_hda_intel" device.bus_path = "pci-0000:00:14.2" sysfs.path = "/devices/pci0000:00/0000:00:14.2/sound/card0" device.bus = "pci" device.vendor.id = "1002" device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]" device.product.id = "4383" device.product.name = "SBx00 Azalia (Intel HDA)" device.form_factor = "internal" device.string = "0" device.description = "Audio Interno" module-udev-detect.discovered = "1" device.icon_name = "audio-card-pci" profiles: input:analog-stereo: Estéreo analógico Entrada (priority 65, available: no) output:analog-stereo: Estéreo analógico Salida (priority 6500, available: no) output:analog-stereo+input:analog-stereo: Estéreo Analógico Dúplex (priority 6565, available: no) output:analog-surround-21: Análogico envolvente 2.1 Salida (priority 1300, available: no) output:analog-surround-21+input:analog-stereo: Análogico envolvente 2.1 Salida + Estéreo analógico Entrada (priority 1365, available: no) output:analog-surround-40: Analógico envolvente 4.0 Salida (priority 1200, available: no) output:analog-surround-40+input:analog-stereo: Analógico envolvente 4.0 Salida + Estéreo analógico Entrada (priority 1265, available: no) output:analog-surround-41: Analógico envolvente 4.1 Salida (priority 1300, available: no) output:analog-surround-41+input:analog-stereo: Analógico envolvente 4.1 Salida + Estéreo analógico Entrada (priority 1365, available: no) output:analog-surround-50: Analógico envolvente 5.0 Salida (priority 1200, available: no) output:analog-surround-50+input:analog-stereo: Analógico envolvente 5.0 Salida + Estéreo analógico Entrada (priority 1265, available: no) output:analog-surround-51: Analógico envolvente 5.1 Salida (priority 1300, available: no) output:analog-surround-51+input:analog-stereo: Analógico envolvente 5.1 Salida + Estéreo analógico Entrada (priority 1365, available: no) output:analog-surround-71: Analog Surround 7.1 Salida (priority 1200, available: no) output:analog-surround-71+input:analog-stereo: Analog Surround 7.1 Salida + Estéreo analógico Entrada (priority 1265, available: no) output:iec958-stereo: Estéreo Digital (IEC958) Salida (priority 5500, available: unknown) output:iec958-stereo+input:analog-stereo: Estéreo Digital (IEC958) Salida + Estéreo analógico Entrada (priority 5565, available: no) off: Apagado (priority 0, available: unknown) active profile: <off> ports: analog-input-front-mic: Micrófono frontal (priority 8500, latency offset 0 usec, available: no) properties: device.icon_name = "audio-input-microphone" analog-input-rear-mic: Micrófono trasero (priority 8200, latency offset 0 usec, available: no) properties: device.icon_name = "audio-input-microphone" analog-input-linein: En línea (priority 8100, latency offset 0 usec, available: no) properties: analog-output-lineout: Línea de salida (priority 9000, latency offset 0 usec, available: no) properties: analog-output-headphones: Auriculares analógicos (priority 9900, latency offset 0 usec, available: no) properties: device.icon_name = "audio-headphones" iec958-stereo-output: Salida digital (S/PDIF) (priority 0, latency offset 0 usec, available: unknown) properties: -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1834771 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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