So, It looks like we need to set some coeff to make the internal mic work, but only Realtek engineers know how to set the coeff registers.
And do one more test for external mic: run sudo hdajacksensetest -a plug the headset or external mic run sudo hdajacksensetest -a again upload the output-before.txt and output-after.txt. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1846148 Title: Realtek ALC256M with DTS Audio Processing internal microphone doesn't work on Redmi Book 14 2019 Status in alsa-driver package in Ubuntu: Confirmed Bug description: Sound works okay but the internal mic doesn't work. When I plug in headset, the mic on headset also doens't work. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 5.0.0-29.31~18.04.1-generic 5.0.21 Uname: Linux 5.0.0-29-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: lilian 1689 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Tue Oct 1 12:27:10 2019 InstallationDate: Installed on 2019-09-21 (9 days ago) InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Title: PCI/internal sound card not detected UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/19/2019 dmi.bios.vendor: TIMI dmi.bios.version: RMRCM400P0100 dmi.board.name: TM1901 dmi.board.vendor: TIMI dmi.chassis.type: 10 dmi.chassis.vendor: TIMI dmi.modalias: dmi:bvnTIMI:bvrRMRCM400P0100:bd08/19/2019:svnTIMI:pnRedmiBook14:pvr:rvnTIMI:rnTM1901:rvr:cvnTIMI:ct10:cvr: dmi.product.family: Mi Laptop dmi.product.name: RedmiBook 14 dmi.product.sku: TM1901-24822 dmi.sys.vendor: TIMI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1846148/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
