On other machines, there is serial bus controller (i2c controller), but
your machine doesn't have it, maybe you could enable it in the BIOS
setting? You could find the I2C controller with lspci as below:


00:15.0 Serial bus controller [0c80]: Intel Corporation Tiger Lake-LP Serial IO 
I2C Controller #0 [8086:a0e8] (rev 20)
        DeviceName: Onboard - Other
        Subsystem: Device [1e39:a025]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 27
        Region 0: Memory at 4017000000 (64-bit, non-prefetchable) [virtual] 
[size=4K]
        Capabilities: <access denied>
        Kernel driver in use: intel-lpss
        Kernel modules: intel_lpss_pci

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1943368

Title:
  Touchpad not recognised

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  the touchpad is not recognised

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-81-generic 5.4.0-81.91
  ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
  Uname: Linux 5.4.0-81-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bem        1753 F.... pulseaudio
   /dev/snd/pcmC0D0p:   bem        1753 F...m pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep 12 15:55:20 2021
  InstallationDate: Installed on 2021-08-17 (25 days ago)
  InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 
(20200806.1)
  MachineType: Medion Akoya E6239
  ProcEnviron:
   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-5.4.0-81-generic 
root=UUID=a2ea56ce-d8fa-4472-954d-4c580bee4549 ro i8042.nomux=1 quiet splash 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-81-generic N/A
   linux-backports-modules-5.4.0-81-generic  N/A
   linux-firmware                            1.187.16
  SourcePackage: linux
  UpgradeStatus: Upgraded to focal on 2021-08-18 (25 days ago)
  dmi.bios.date: 04/09/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 612
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Akoya E6239
  dmi.board.vendor: Medion
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Medion
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr612:bd04/09/2014:svnMedion:pnAkoyaE6239:pvr1.0:rvnMedion:rnAkoyaE6239:rvr1.0:cvnMedion:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: Akoya E6239
  dmi.product.sku: To be filled by O.E.M.
  dmi.product.version: 1.0
  dmi.sys.vendor: Medion

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