All kernel changes from 6.8.0-35 to 6.8.0-38:

8902291975c6 Bluetooth: btintel: Fixe build regression
5a51a3be7e02 Bluetooth: Add new quirk for broken read key length on ATS2851
01a5bff079f2 Bluetooth: btmtk: Add MODULE_FIRMWARE() for MT7922
842b2829368f Bluetooth: btintel: Fix null ptr deref in btintel_read_version
50023458b1c0 Bluetooth: qca: fix device-address endianness
d914e8c40003 Revert "Bluetooth: hci_qca: Set BDA quirk bit if fwnode exists in 
DT"

I didn't see any related changes.

Could you check with the latest linux-firmware for bluetooth [1]?

Please cp all the files in [1] to /lib/firmware/intel,
$ update-initramfs -u -k all

IMPORTANT: Power cycle and retry.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-
firmware.git/tree/intel

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https://bugs.launchpad.net/bugs/2073047

Title:
  Regression on Linux 6.8.0-38: Bluetooth adapter (Intel AX200) stops
  working after a few suspend/resume cycles

Status in linux package in Ubuntu:
  Triaged

Bug description:
  After upgrading to Linux 6.8.0-38, Bluetooth adapter (USB part of the
  Intel AX200) stops working after a few suspend/resume cycles. WiFi
  (PCIe part) continues to work as expected.

  Kernel log shows:
  Bluetooth: hci0: Reading Intel version command failed (-110)
  instead of the usual:
  Bluetooth: hci0: Bootloader revision 0.3 build 0 week 24 2017
  Bluetooth: hci0: Device revision is 1
  Bluetooth: hci0: Secure boot is enabled
  Bluetooth: hci0: OTP lock is enabled
  Bluetooth: hci0: API lock is enabled
  Bluetooth: hci0: Debug lock is disabled
  Bluetooth: hci0: Minimum firmware build 1 week 10 2014
  Bluetooth: hci0: Found device firmware: intel/ibt-20-1-3.sfi
  Bluetooth: hci0: Boot Address: 0x24800
  Bluetooth: hci0: Firmware Version: 255-255.255
  Bluetooth: hci0: Waiting for firmware download to complete
  Bluetooth: hci0: Firmware loaded in 2111457 usecs
  Bluetooth: hci0: Waiting for device to boot
  Bluetooth: hci0: Device booted in 14560 usecs
  Bluetooth: hci0: Malformed MSFT vendor event: 0x02
  Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-20-1-3.ddc
  Bluetooth: hci0: Applying Intel DDC parameters completed
  Bluetooth: hci0: Firmware revision 0.3 build 249 week 27 2023
  Bluetooth: hci0: HCI LE Coded PHY feature bit is set, but its usage is not 
supported.
  Bluetooth: MGMT ver 1.22

  First appeared on 6.8.0-38, 6.8.0-36 and earlier worked without issues.
  I suspect linux-firmware might be missing updates corresponding to changes in 
the kernel driver or a regression was introduced in the update.

  Machine: Dell XPS13-9350
  Device: Intel AX200 Rev 1a (WiFi/Bluetooth combo)

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