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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 :
https://answers.launchpad.net/ubuntu/+question/691511

Kubuntu 20.04
Lenovo IdeaPad L340-15IRH - Type 81LK
--- 
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /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)
Lsusb:
 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
RelatedPackageVersions:
 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.modalias: 
dmi:bvnLENOVO:bvrBGCN29WW:bd02/10/2020:svnLENOVO:pn81LK:pvrIdeaPadL340-15IRHGaming:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrIdeaPadL340-15IRHGaming:
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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected bot-comment focal
-- 
Touchpad switch not working (Lenovo IdeaPad L340-15IRH, Kubuntu 20.04)
https://bugs.launchpad.net/bugs/1885033
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