I informed Lenovo support of the discussed issue on Feb,04 2020. Since then I discovered an update [1] (CJCN25WW), but it still doesn't solve the issue.
It's changelog said: "Summary of changes ================== General Information: CJCN25WW: 1. Update EC to CJEC27WW 2. Lenovo diagnostic of NOVO menu (04.11.000) 3. Intel release 2019 '2nd Security 4. BIOS initialize time (S3 resume) 5. Update thermal function for dGPU DPM" Today, Mar,02 2020 one more BIOS update (CJCN26WW) [2] appeared on Lenovo's web site with a change log saying: "Summary of changes ================== General Information: CJCN26WW: 1. Update EC to CJEC28WW" Guess there is still no change to ACPI table, but didn't have a chance to try it myself yet. [1] https://download.lenovo.com/consumer/mobiles/cjcn25ww.txt [2] https://download.lenovo.com/consumer/mobiles/cjcn26ww.txt https://download.lenovo.com/consumer/mobiles/cjcn26ww.exe -- 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/1853277 Title: Lenovo ThinkBook 14-IML Touchpad not showing up in /proc/bus/input/devices Status in linux package in Ubuntu: Confirmed Bug description: This is happening on a ThinkBook 14 IML 20RV. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-18-generic 5.3.0-18.19+1 ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1 Uname: Linux 5.3.0-18-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1848 F.... pulseaudio CasperVersion: 1.427 CurrentDesktop: ubuntu:GNOME Date: Wed Nov 20 11:10:52 2019 LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: LENOVO 20RV ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed quiet splash --- RelatedPackageVersions: linux-restricted-modules-5.3.0-18-generic N/A linux-backports-modules-5.3.0-18-generic N/A linux-firmware 1.183 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/10/2019 dmi.bios.vendor: LENOVO dmi.bios.version: CJCN21WW dmi.board.name: LVA/LVAB dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.modalias: dmi:bvnLENOVO:bvrCJCN21WW:bd10/10/2019:svnLENOVO:pn20RV:pvrLenovoThinkBook14-IML:rvnLENOVO:rnLVA/LVAB:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvr: dmi.product.family: ThinkBook 14-IML dmi.product.name: 20RV dmi.product.sku: LENOVO_MT_20RV_BU_idea_FM_ThinkBook 14-IML dmi.product.version: Lenovo ThinkBook 14-IML dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853277/+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
