** Tags added: patch

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https://bugs.launchpad.net/bugs/1898326

Title:
  touchpad not detected

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Touchpad is not detected at all, there's no touchpad device in
  "/proc/bus/input/devices".

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-48-generic 5.4.0-48.52
  ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chenchifan   1002 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Oct  3 13:37:30 2020
  InstallationDate: Installed on 2020-08-12 (51 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: LENOVO 81Q7
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic 
root=UUID=79381bd5-78f8-44f3-b125-714ee8298ab5 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-48-generic N/A
   linux-backports-modules-5.4.0-48-generic  N/A
   linux-firmware                            1.187.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/03/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: AKCN31WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga S940-14IWL
  dmi.modalias: 
dmi:bvnLENOVO:bvrAKCN31WW:bd04/03/2019:svnLENOVO:pn81Q7:pvrLenovoYogaS940-14IWL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS940-14IWL:
  dmi.product.family: Yoga S940-14IWL
  dmi.product.name: 81Q7
  dmi.product.sku: LENOVO_MT_81Q7_BU_idea_FM_Yoga S940-14IWL
  dmi.product.version: Lenovo Yoga S940-14IWL
  dmi.sys.vendor: LENOVO

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