Ok. Other than ask Lenovo to share the spec or implement a patch,
there's nothing else we can do here.

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  Touchpad switch not working (Lenovo IdeaPad L340-15IRH, Kubuntu 20.04)

Status in linux package in Ubuntu:

Bug description:
  The touchpad switch, Fn-F6, does not work for me. It does work on Windows 10 
(dual boot)
  The touchpad works well, but I can only set the option in System Conguration.

  See launchpad answer :

  Kubuntu 20.04
  Lenovo IdeaPad L340-15IRH - Type 81LK
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
   /dev/snd/controlC0:  yann       1350 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-02-20 (125 days ago)
  InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f2:b604 Chicony Electronics Co., Ltd Integrated 
Camera (1280x720@30)
   Bus 001 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
   Bus 001 Device 004: ID 0cf3:e500 Qualcomm Atheros Communications 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 81LK
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-37-generic 
root=UUID=0ac30ea3-dc16-4323-a1a3-acea99fa90b5 ro quiet splash 
resume=/dev/nvme0n1p6 vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
   linux-restricted-modules-5.4.0-37-generic N/A
   linux-backports-modules-5.4.0-37-generic  N/A
   linux-firmware                            1.187
  Tags:  focal
  Uname: Linux 5.4.0-37-generic x86_64
  UpgradeStatus: Upgraded to focal on 2020-05-14 (41 days ago)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/10/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: BGCN29WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: NO DPK
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: IdeaPad L340-15IRH Gaming
  dmi.product.family: IdeaPad L340-15IRH Gaming
  dmi.product.name: 81LK
  dmi.product.sku: LENOVO_MT_81LK_BU_idea_FM_IdeaPad L340-15IRH Gaming
  dmi.product.version: IdeaPad L340-15IRH Gaming
  dmi.sys.vendor: LENOVO

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