*** This bug is a duplicate of bug 1885573 ***
    https://bugs.launchpad.net/bugs/1885573

It is working now! Using kernel 5.4.0-42-generic and adding the
"i8042.nopnp=1 pci=nocrs" kernel parameters to grub made the touchpad
work.

(I also tried the solution proposed by Ferenc in Bug #1861610. It didn't
work, but I cannot be sure if only using the kernel parameter works, so
if it doesn't look there).

** Description changed:

  Touchpad not working and does not show in /proc/bus/input/devices
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-24-generic 5.4.0-24.28
  ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
  Uname: Linux 5.4.0-24-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  hockenberry   1405 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  hockenberry   1405 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Apr 19 18:55:43 2020
  InstallationDate: Installed on 2020-04-14 (5 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
  Lsusb:
-  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-  Bus 001 Device 003: ID 046d:c542 Logitech, Inc. Wireless Receiver
-  Bus 001 Device 002: ID 13d3:5a08 IMC Networks Integrated Camera
-  Bus 001 Device 004: ID 8087:0aaa Intel Corp. 
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 003: ID 046d:c542 Logitech, Inc. Wireless Receiver
+  Bus 001 Device 002: ID 13d3:5a08 IMC Networks Integrated Camera
+  Bus 001 Device 004: ID 8087:0aaa Intel Corp.
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 81W8
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-24-generic 
root=UUID=13de703e-a708-4fe2-a00d-136215c4176a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-5.4.0-24-generic N/A
-  linux-backports-modules-5.4.0-24-generic  N/A
-  linux-firmware                            1.187
+  linux-restricted-modules-5.4.0-24-generic N/A
+  linux-backports-modules-5.4.0-24-generic  N/A
+  linux-firmware                            1.187
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: DKCN24WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40700 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad S145-15IIL
  dmi.modalias: 
dmi:bvnLENOVO:bvrDKCN24WW:bd11/26/2019:svnLENOVO:pn81W8:pvrLenovoIdeaPadS145-15IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40700WIN:cvnLENOVO:ct10:cvrLenovoIdeaPadS145-15IIL:
  dmi.product.family: IdeaPad S145-15IIL
  dmi.product.name: 81W8
  dmi.product.sku: LENOVO_MT_81W8_BU_idea_FM_IdeaPad S145-15IIL
  dmi.product.version: Lenovo IdeaPad S145-15IIL
  dmi.sys.vendor: LENOVO

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https://bugs.launchpad.net/bugs/1873677

Title:
  Lenovo Ideapad S145 - Touchpad not recognized at all

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