I'm also affected by this bug under Linux Mint 19.2 and with Radeon RX 580 (amdgpu driver). With all new Kernels from 5.0.0-16 on my HDMI monitor isn't recognized as "plugged in" and I don't have audio output. Pavucontrol shows all available HDMI imputs as "unplugged".
Going back to 5.0.0-15 Kernel fixes the issue for me but this cannot be a long term solution. Over the last months I searched a lot in different Ubuntu/Linux Mint forums and found many people having this exact issue. All of them with amd graphics. Finally found the root of this problem: This faulty behavior seems to be introduced with this bugfix: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1827967 All Kernels from 5.0.0-16, 4.15.0-51 and 4.18.0-21 on are affected. In forums I found examples of all three Kernels. reply #26: As I (and probably also Gary Altenberg - #24) don't have any Nvidia chips along our amd graphics, I have no idea how the nvidia proprietary driver could help. ;-) If I understand the bug description of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1827967 correctly, the problem was that there were some unnecessary sound devices that could confuse users. In fact, the patch might have broken hdmi sound output for most amd graphics users by removing all of the entries. Please fix that issue or if not possible revert the change! Having some unnecessary entries to chose from is better than having no sound at all. :-) Here are two examples of affected user from forums (but you can find many more): - https://forums.linuxmint.com/viewtopic.php?t=295685 - https://askubuntu.com/questions/1032811/ubuntu-18-04-no-hdmi-audio-with-amd-radeon-hd-7870/1150624#1150624 - ... -- 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834771/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
