Wanted to pop in and mention I've encountered this same issue on several
HP Spectre devices, on some of which the current workaround doesn't seem
to work (as of kernel version 5.13.10). I've put together a DKMS build
of the patched module for people to use until this can be upstreamed or
included as a patch in various distributions.

https://github.com/berzoidberg/i8042-spectre-dkms

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https://bugs.launchpad.net/bugs/1916314

Title:
  HP Spectre x360 14-ea0xxx Tiger Lake Keyboard does not work until
  ~30-60 seconds after boot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On the HP Spectre x360 14-ea0xxx (Tiger Lake), the keyboard is
  inoperable for ~30-60 seconds after system boot.

  Kernel logging reveals that it did not detect the keyboard during this
  time.

  An analysis of this and a patch can be found at:

  https://www.spinics.net/lists/linux-input/msg71677.html

  
  A workaround is to add i8042.nopnp to the kernel command line
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu50.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maxb       1195 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 20.10
  InstallationDate: Installed on 2021-02-03 (23 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  MachineType: HP HP Spectre x360 Convertible 14-ea0xxx
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-44-generic 
root=UUID=11ab54a5-5193-4f3c-b722-124d50665745 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.8.0-44.50-generic 5.8.18
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-44-generic N/A
   linux-backports-modules-5.8.0-44-generic  N/A
   linux-firmware                            1.190.3
  Tags:  groovy
  Uname: Linux 5.8.0-44-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/13/2021
  dmi.bios.release: 15.9
  dmi.bios.vendor: AMI
  dmi.bios.version: F.09
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 87F7
  dmi.board.vendor: HP
  dmi.board.version: 40.43
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.ec.firmware.release: 40.43
  dmi.modalias: 
dmi:bvnAMI:bvrF.09:bd01/13/2021:br15.9:efr40.43:svnHP:pnHPSpectrex360Convertible14-ea0xxx:pvr:rvnHP:rn87F7:rvr40.43:cvnHP:ct31:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP Spectre
  dmi.product.name: HP Spectre x360 Convertible 14-ea0xxx
  dmi.product.sku: 2G2C7EA#ABU
  dmi.sys.vendor: HP

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