During the architectural design of the WMI subsystem an assumption was
made that there was a 1:1 mapping of WMI GUIDs (that is they're unique).
This hasn't caused MAJOR functional problems, but this was proven wrong,
as it's possible to fetch multiple BMOFs.

This change makes it so that if you have the wmi-bmof driver loaded on
your system you'll be able to fetch all of the BMOFs.  If you look in
/sys/bus/wmi/devices, you should see more entries with this patch in
place.

If the same GUID is used multiple times on a system for any reason
beside wmi-bmof, that driver may need to be changed too.

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https://bugs.launchpad.net/bugs/1806437

Title:
  acpi PNP0C14:02: duplicate WMI GUID
  05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on
  PNP0C14:01)

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  dmesg:
  [   15.390738] acpi PNP0C14:02: duplicate WMI GUID 
05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:01)

  Best regards,
  --
  Cristian Aravena Romero (caravena)

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-4.18.0-11-generic 4.18.0-11.12
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  caravena   2769 F.... pulseaudio
   /dev/snd/pcmC0D0p:   caravena   2769 F...m pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Dec  3 12:49:26 2018
  HibernationDevice: RESUME=UUID=efcf081f-0bb0-4907-b78c-1299aa4aee57
  InstallationDate: Installed on 2018-12-02 (0 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: HP HP Pavilion x360 Convertible 14-cd0xxx
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.18.0-11-generic 
root=UUID=28bdadba-133c-4f5b-a5c9-b06993ea7ce2 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-11-generic N/A
   linux-backports-modules-4.18.0-11-generic  N/A
   linux-firmware                             1.176
  SourcePackage: linux
  UpgradeStatus: Upgraded to disco on 2018-12-02 (0 days ago)
  dmi.bios.date: 06/14/2018
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.13
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 8486
  dmi.board.vendor: HP
  dmi.board.version: 72.19
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.13:bd06/14/2018:svnHP:pnHPPavilionx360Convertible14-cd0xxx:pvrType1ProductConfigId:rvnHP:rn8486:rvr72.19:cvnHP:ct31:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP Pavilion
  dmi.product.name: HP Pavilion x360 Convertible 14-cd0xxx
  dmi.product.sku: 3PX63LA#ABM
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP

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