@Kai-Heng, Apologies for the delay in my reply...
I tested to the best of my ability using the Audacity audio application in both Linux Mint 19.3 (where audio output works) and Ubuntu 20.04 (where audio output does not work) and it appears that audio input via microphones is not supported. I tested with a standard microphone as well as with a combination headset with an integrated microphone. Based on the block diagram on page 35 (printed page 27) of the technical specifications for the unit --> https://www.intel.com/content/dam/support/us/en/documents/mini- pcs/NUC8CCH_TechProdSpec.pdf it appears that the audio port is only a line out jack. I attempted to use the "hdajackretask" application you mention, however when attempting to do so I receive an error message 'Device or resource busy' when I attempt to apply the override. I have attached a screenshot of the specific error. Please let me know if I can provide any additional information, and thank you as always for the help! ** Attachment added: "hdajackretask_error.png" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875199/+attachment/5396553/+files/hdajackretask_error.png -- 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/1875199 Title: [NUC8CCHK][HDA-Intel - HDA Intel PCH, playback] No sound at all Status in linux package in Ubuntu: Incomplete Bug description: No sound output. Only a 'Dummy' audio output device is listed in the Gnome Sound application. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: pulseaudio 1:13.99.1-1ubuntu3 ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 Uname: Linux 5.4.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: rboerner 1205 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Apr 26 12:12:49 2020 InstallationDate: Installed on 2020-04-25 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: pulseaudio Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_DevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: rboerner 1205 F.... pulseaudio Symptom_PulsePlaybackTest: PulseAudio playback test failed Symptom_Type: No sound at all Title: [HDA-Intel - HDA Intel PCH, playback] No sound at all UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/25/2020 dmi.bios.vendor: Intel Corp. dmi.bios.version: CHAPLCEL.0048.2020.0225.1640 dmi.board.name: NUC8CCHB dmi.board.vendor: Intel Corporation dmi.board.version: K44767-502 dmi.chassis.type: 35 dmi.chassis.vendor: Intel Corporation dmi.chassis.version: 2.0 dmi.modalias: dmi:bvnIntelCorp.:bvrCHAPLCEL.0048.2020.0225.1640:bd02/25/2020:svnIntel(R)ClientSystems:pnNUC8CCHK:pvrK44798-502:rvnIntelCorporation:rnNUC8CCHB:rvrK44767-502:cvnIntelCorporation:ct35:cvr2.0: dmi.product.family: CH dmi.product.name: NUC8CCHK dmi.product.sku: BKNUC8CCHKR dmi.product.version: K44798-502 dmi.sys.vendor: Intel(R) Client Systems --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: rboerner 1215 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-04-25 (6 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Intel(R) Client Systems NUC8CCHK Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-28-generic root=UUID=afbb0f64-e729-46a8-82e4-a060e9e729c4 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30 RelatedPackageVersions: linux-restricted-modules-5.4.0-28-generic N/A linux-backports-modules-5.4.0-28-generic N/A linux-firmware 1.187 Tags: focal Uname: Linux 5.4.0-28-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 02/25/2020 dmi.bios.vendor: Intel Corp. dmi.bios.version: CHAPLCEL.0048.2020.0225.1640 dmi.board.name: NUC8CCHB dmi.board.vendor: Intel Corporation dmi.board.version: K44767-502 dmi.chassis.type: 35 dmi.chassis.vendor: Intel Corporation dmi.chassis.version: 2.0 dmi.modalias: dmi:bvnIntelCorp.:bvrCHAPLCEL.0048.2020.0225.1640:bd02/25/2020:svnIntel(R)ClientSystems:pnNUC8CCHK:pvrK44798-502:rvnIntelCorporation:rnNUC8CCHB:rvrK44767-502:cvnIntelCorporation:ct35:cvr2.0: dmi.product.family: CH dmi.product.name: NUC8CCHK dmi.product.sku: BKNUC8CCHKR dmi.product.version: K44798-502 dmi.sys.vendor: Intel(R) Client Systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875199/+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