Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10-rc4/amd64/

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1902156

Title:
  [ASUS VivoBook X541UJ] Keyboard and touchpad don't work on kernel
  5.8.0.29, but 5.4 or 5.8.16 work

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  when I updated my system to ubuntu 20.10, the keyboard and mouse no longer 
worked after a little investigation, I found out the kernel causes this 
problem, downgrading to linux 5.4 or upgrading to linux kernel 5.8.11 solved 
this issue, I also found that this problem is present on other ASUS laptop 
models ( my laptop is ASUS) so you may want to investigate this issue to update 
your default 20.10 Linux kernel.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  joseph     1979 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.10
  InstallationDate: Installed on 2019-06-03 (515 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: ASUSTeK COMPUTER INC. X541UJ
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-26-generic 
root=UUID=1298f5d0-e6c0-4aa3-9c5a-fbe0ebf0fc02 ro quiet splash pci=noaer 
mds=full,nosmt vt.handoff=7
  ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-26-generic N/A
   linux-backports-modules-5.8.0-26-generic  N/A
   linux-firmware                            1.190
  Tags:  groovy
  Uname: Linux 5.8.0-26-generic x86_64
  UpgradeStatus: Upgraded to groovy on 2020-10-24 (5 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/18/2019
  dmi.bios.release: 5.12
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X541UJ.310
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X541UJ
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX541UJ.310:bd04/18/2019:br5.12:svnASUSTeKCOMPUTERINC.:pnX541UJ:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX541UJ:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.family: VivoBook
  dmi.product.name: X541UJ
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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