Apologies for the delay, I have been instructed to use kernel mailing list to 
report the bug.
System boots fine once you use acpi_osi= argument with complete functionality. 
This has been true for all 5.x kernels to this date.

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  [HP Pavilion 360 - 13-a200nt (ENERGY STAR)] Kernel parameter acpi_osi=
  required to boot

Status in Linux:
Status in linux package in Ubuntu:

Bug description:
  When booting my HP Pavilion 360 - 13-a200nt (ENERGY STAR), it stops
  with just a non-blinking white cursor on screen in the top left, and
  the Caps Lock doesn't respond when pressed.

  Previously on 4.x kernels, system would boot using acpi=off argument
  creating more problems.

  WORKAROUND: Boot with kernel parameter:

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: linux-image-5.3.0-18-generic 5.3.0-18.19+1
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC0:  ilgaz     21270 F.... pulseaudio
   /dev/snd/controlC1:  ilgaz     21270 F.... pulseaudio
   /dev/snd/pcmC1D0p:   ilgaz     21270 F...m pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 17 10:02:44 2019
  HibernationDevice: RESUME=UUID=f34af719-8757-473b-848b-7db85d6fefae
  InstallationDate: Installed on 2019-10-13 (3 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 
  MachineType: Hewlett-Packard HP Pavilion 13 x360 PC
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-18-generic 
root=UUID=f6787f82-d072-410e-8058-2b7f14d012b9 ro verbose pci=biosirq acpi_osi=
   linux-restricted-modules-5.3.0-18-generic N/A
   linux-backports-modules-5.3.0-18-generic  N/A
   linux-firmware                            1.183
  SourcePackage: linux
  UpgradeStatus: Upgraded to eoan on 2019-10-16 (0 days ago)
  dmi.bios.date: 06/21/2018
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.41
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 2341
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 07.0A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
  dmi.product.name: HP Pavilion 13 x360 PC
  dmi.product.sku: L0B89EA#AB8
  dmi.product.version: 0977120000405F00000410180
  dmi.sys.vendor: Hewlett-Packard

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