Yes.. I'm a little confused. For example the previously mentioned thread
(id=215167) is still very much ongoing, with some people reporting that
certain kernel versions fix this and others reporting it showing up in
regressions as late as 6.2.

They referenced a message
https://lore.kernel.org/all/[email protected]/ refers
to commit 95655456e7cee858a23793f67025765b4c4c227b upstream, which was
merged into 5.16 mainline last year. https://lkml.org/lkml/2022/1/14/195
-- I will post back in the bugzilla thread later that this seems to be
unrelated.

I believe on the Ubuntu side patching from 5.11 to 5.15 caused this
problem for me. And it would appear that 5.19 has it as well. But
needless to say in "stable LTS" (22.04.2/5.15) this is still happening,
breaking bluetooth for Ubuntu users.

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https://bugs.launchpad.net/bugs/1960016

Title:
  | Kernel 5.15 Regression | ' Bluetooth: hci0: command tx timeout '

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  With the current daily-build of 'jammy 22.04' it is not possible to enable 
Bluetooth with (some) Intel Bluetooth devices after reboot/warm boot.
  With a Cold boot it is working.
   
  My hardware: $ lsusb
  Bus 001 Device 004: ID 8087:0a2a Intel Corp. Bluetooth wireless interface

  This is because of a regression in Kernel 5.15 and was present in Fedora and 
other Distributions as well.
  https://bugzilla.redhat.com/show_bug.cgi?id=2027071
  https://bugzilla.opensuse.org/show_bug.cgi?id=1193124

  For example on Fedora35 my Bluetooth did not initialize correctly
  after warm boot between versions 5.14.18 > 5.15.14.
  After a cold boot it worked.
  (Turned off the desktop PC and disconnected it from power for a few seconds.)

  Kernel 5.15.15 changed that and since then everything went fine again.
  https://bodhi.fedoraproject.org/updates/FEDORA-2022-a23dd56848

  The fix is mentioned there…
  
https://lore.kernel.org/lkml/[email protected]/T/#m77ab9e84eec72d1b3e16d6862ffb1a2670277d94

  Direct-Link to commit mentioned in the above discussion…
  
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=95655456e7cee858a23793f67025765b4c4c227b

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: linux-image-generic-hwe-20.04 5.15.0.18.18
  ProcVersionSignature: Ubuntu 5.15.0-18.18-generic 5.15.12
  Uname: Linux 5.15.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu76
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Feb  4 12:26:46 2022
  InstallationDate: Installed on 2022-02-02 (1 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220201)
  MachineType: Gigabyte Technology Co., Ltd. AB350N-Gaming WIFI
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-18-generic 
root=UUID=91d2d15b-9614-4498-bb5c-d3376034009f ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-18-generic N/A
   linux-backports-modules-5.15.0-18-generic  N/A
   linux-firmware                             20220124.git0c6a7b3b-0ubuntu1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/13/2021
  dmi.bios.release: 5.17
  dmi.bios.vendor: American Megatrends International, LLC.
  dmi.bios.version: F51d
  dmi.board.asset.tag: Default string
  dmi.board.name: AB350N-Gaming WIFI-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: Default string
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF51d:bd12/13/2021:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnAB350N-GamingWIFI:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350N-GamingWIFI-CF:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: AB350N-Gaming WIFI
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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