It's weird there's a mouse detected but not recognized as an input device.
Can you show me the result of the command `ls  /sys/bus/acpi/devices/`? Since 
there's a PS2M(ps/2 touchpad) device and a TPD0 (i2c interface) device in the 
ACPI dsdt file which should represent the Touchpad. I need to know which one is 
recognized by ACPI and I can tell the touchpad is from Elantech or Synaptic. 
The we can dig further for what really happened. Thanks

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https://bugs.launchpad.net/bugs/1939743

Title:
  No Touchpad on TravelMate-P2 laptop

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On the TravelMate P215-53 V1.10 by Acer when running Ubuntu, the
  trackpad is entirely non-functional and does not appear in the
  /proc/bus/input/devices list. A wired usb mouse works perfectly, but
  there does not seem to be a tweak that enables the trackpad to be seen
  by the kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-54-generic 5.4.0-54.60
  ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
  Uname: Linux 5.4.0-54-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug 12 14:30:39 2021
  InstallationDate: Installed on 2020-12-09 (245 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  MachineType: Acer TravelMate P215-53
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-54-generic 
root=/dev/nvme0n1p2 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-54-generic N/A
   linux-backports-modules-5.4.0-54-generic  N/A
   linux-firmware                            1.187.15
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 12/17/2020
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: V1.10
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: BassDrum_TL
  dmi.board.vendor: TGL
  dmi.board.version: V1.10
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnINSYDECorp.:bvrV1.10:bd12/17/2020:svnAcer:pnTravelMateP215-53:pvrV1.10:rvnTGL:rnBassDrum_TL:rvrV1.10:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.family: TravelMate P2
  dmi.product.name: TravelMate P215-53
  dmi.product.sku: 0000000000000000
  dmi.product.version: V1.10
  dmi.sys.vendor: Acer

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