Bob:

>"...is it just going from 4.17rc6 to 4.16.6 and seeing when bluetooth
started working?"

Yes. To advise, the article
https://wiki.ubuntu.com/Kernel/KernelBisection covers this answer
precisely, and was written for folks who don't know anything about
linux, so it's easy to follow.

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https://bugs.launchpad.net/bugs/1767180

Title:
  Bluetooth of the Asus Maximus X Hero Wifi AC motherboard doesnt work
  using the Realtek 8822BE driver

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  What you expected to happen
  For the Asus Maximus X Hero Wifi AC motherboards' bluetooth to work

  What happened instead
  Bluetooth does not work

  lsb_release -rd
  Description:  Ubuntu Bionic Beaver (development branch)
  Release:      18.04

  My custom computer uses an Asus Maximus X Hero Wifi AC motherboard,
  which uses the Realtek 8822BE driver to cotrol wifi and bluetooth.
  Support for this driver was added on kernel 4.14, however only wifi
  works. Bluetooth appears as disabled on the Bluetooth adapters
  program, but on rfkill it is not blocked, and it is not disabled on
  the motherboards' settings.

  This was tested on an Ubuntu-Mate 18.04 Beta 2, Ubuntu 16.04LTS and Ubuntu 
17.10 using kernel 4.15. Tried 4.16 just in case, but it didn't work.
  --- 
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  azul       1431 F.... pulseaudio
   /dev/snd/controlC0:  azul       1431 F.... pulseaudio
  CurrentDesktop: MATE
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-04-08 (18 days ago)
  InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Beta amd64 
(20180404)
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic 
root=UUID=d3f1f2d4-b9ff-4e28-b840-fe563d5df18d ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  StagingDrivers: r8822be
  Tags:  bionic staging
  Uname: Linux 4.15.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/09/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1301
  dmi.board.asset.tag: Default string
  dmi.board.name: ROG MAXIMUS X HERO (WI-FI AC)
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1301:bd04/09/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGMAXIMUSXHERO(WI-FIAC):rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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