sudo dmesg |grep -i bluetooth

[    4.382987] Bluetooth: Core ver 2.22

[    4.383014] NET: Registered PF_BLUETOOTH protocol family

[    4.383016] Bluetooth: HCI device and connection manager initialized

[    4.383021] Bluetooth: HCI socket layer initialized

[    4.383023] Bluetooth: L2CAP socket layer initialized

[    4.383029] Bluetooth: SCO socket layer initialized

[    4.663829] Bluetooth: Patch file not found ar3k/AthrBT_0x11020000.dfu

[    4.663832] Bluetooth: Loading patch file failed

[    9.072626] xfs filesystem being remounted at /run/systemd/unit-root/var/lib/bluetooth supports timestamps until 2038 (0x7fffffff)

[    9.127087] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

[    9.127091] Bluetooth: BNEP filters: protocol multicast

[    9.127095] Bluetooth: BNEP socket layer initialized

Equipment model: ar5b22

syslog

Apr 20 20:39:58 wuhao-QTJ5 systemd[1]: Starting Bluetooth management mechanism...

Apr 20 20:39:58 wuhao-QTJ5 systemd[1]: Started Bluetooth management mechanism.

Apr 20 20:39:58 wuhao-QTJ5 systemd[25096]: Starting Bluetooth OBEX service...

Apr 20 20:39:58 wuhao-QTJ5 systemd[25096]: Started Bluetooth OBEX service.

Apr 21 11:37:02 wuhao-QTJ5 bluetoothd[1345]: Terminating

Apr 21 11:37:33 wuhao-QTJ5 systemd[1]: Starting Bluetooth management mechanism...

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.382987] Bluetooth: Core ver 2.22

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.383014] NET: Registered PF_BLUETOOTH protocol family

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.383016] Bluetooth: HCI device and connection manager initialized

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.383021] Bluetooth: HCI socket layer initialized

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.383023] Bluetooth: L2CAP socket layer initialized

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.383029] Bluetooth: SCO socket layer initialized

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.663829] Bluetooth: Patch file not found ar3k/AthrBT_0x11020000.dfu

Apr 21 11:37:33 wuhao-QTJ5 kernel: [    4.663832] Bluetooth: Loading patch file failed

Apr 21 11:37:33 wuhao-QTJ5 NetworkManager[1035]: <info>  [1650512253.6785] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.36.4/libnm-device-plugin-bluetooth.so)

Apr 21 11:37:34 wuhao-QTJ5 systemd[1]: Started Bluetooth management mechanism.

Apr 21 11:37:35 wuhao-QTJ5 systemd[1]: Starting Bluetooth service...

Apr 21 11:37:35 wuhao-QTJ5 kernel: [    9.072626] xfs filesystem being remounted at /run/systemd/unit-root/var/lib/bluetooth supports timestamps until 2038 (0x7fffffff)

Apr 21 11:37:35 wuhao-QTJ5 bluetoothd[1362]: Bluetooth daemon 5.64

Apr 21 11:37:35 wuhao-QTJ5 systemd[1]: Started Bluetooth service.

Apr 21 11:37:35 wuhao-QTJ5 bluetoothd[1362]: Starting SDP server

Apr 21 11:37:35 wuhao-QTJ5 bluetoothd[1362]: Bluetooth management interface 1.21 initialized

Apr 21 11:37:35 wuhao-QTJ5 kernel: [    9.127087] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

Apr 21 11:37:35 wuhao-QTJ5 kernel: [    9.127091] Bluetooth: BNEP filters: protocol multicast

Apr 21 11:37:35 wuhao-QTJ5 kernel: [    9.127095] Bluetooth: BNEP socket layer initialized

Apr 21 11:40:09 wuhao-QTJ5 systemd[1]: Starting Bluetooth management mechanism...

Apr 21 11:40:09 wuhao-QTJ5 systemd[1]: Started Bluetooth management mechanism.

Apr 21 11:40:09 wuhao-QTJ5 systemd[2084]: Starting Bluetooth OBEX service...

Apr 21 11:40:09 wuhao-QTJ5 systemd[2084]: Started Bluetooth OBEX service.

Dir /lib/firmware/

  ls /lib/firmware/ar*

    /lib/firmware/ar5523.bin

inxi -Fxxxz

System:

  Kernel: 5.15.0-27-generic x86_64 bits: 64 compiler: gcc v: 11.2.0

    Desktop: GNOME 42.0 tk: GTK 3.24.33 wm: gnome-shell dm: GDM3 42.0

    Distro: Ubuntu 22.04 (Jammy Jellyfish)

Machine:

  Type: Laptop System: Hasee product: QTJ5 v: 03 serial: <superuser required>

    Chassis: Quanta type: 10 v: US serial: <superuser required>

  Mobo: Type2 - Board Vendor Name1 model: Type2 - Board Product Name1

    v: Type2 - Board Version serial: <superuser required> UEFI-[Legacy]: Insyde

    v: BR111 date: 02/02/2015

CPU:

  Info: quad core model: Intel 0000 bits: 64 type: MT MCP smt: enabled

    arch: Haswell rev: 2 cache: L1: 256 KiB L2: 1024 KiB L3: 8 MiB

  Speed (MHz): avg: 1265 high: 1996 min/max: 800/2000 cores: 1: 1996

    2: 1451 3: 798 4: 798 5: 798 6: 1055 7: 1995 8: 1229 bogomips: 31924

  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx

Graphics:

  Device-1: Intel 4th Gen Core Processor Integrated Graphics vendor: QUANTA

    driver: i915 v: kernel ports: active: eDP-1 empty: HDMI-A-1,VGA-1

    bus-ID: 00:02.0 chip-ID: 8086:0416 class-ID: 0300

  Device-2: NVIDIA GM108M [GeForce 940M] vendor: QUANTA driver: nvidia

    v: 510.60.02 pcie: speed: 2.5 GT/s lanes: 4 bus-ID: 01:00.0

    chip-ID: 10de:1347 class-ID: 0302

  Device-3: Chicony USB HD Webcam type: USB driver: uvcvideo bus-ID: 3-4:3

    chip-ID: 04f2:b506 class-ID: 0e02 serial: <filter>

  Display: x11 server: X.Org v: 1.21.1.3 compositor: gnome-shell driver: X:

    loaded: modesetting,nvidia unloaded: fbdev,nouveau,vesa gpu: i915

    display-ID: :1 screens: 1

  Screen-1: 0 s-res: 1920x1080 s-dpi: 98 s-size: 499x280mm (19.6x11.0")

    s-diag: 572mm (22.5")

  Monitor-1: eDP-1 res: 1920x1080 hz: 60 dpi: 142

    size: 344x194mm (13.5x7.6") diag: 395mm (15.5") modes: 1920x1080

  OpenGL: renderer: Mesa Intel HD Graphics 4600 (HSW GT2)

    v: 4.6 Mesa 22.0.1 compat-v: 3.1 direct render: Yes

Audio:

  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio

    vendor: QUANTA driver: snd_hda_intel v: kernel bus-ID: 00:03.0

    chip-ID: 8086:0c0c class-ID: 0403

  Device-2: Intel 8 Series/C220 Series High Definition Audio vendor: QUANTA

    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:8c20

    class-ID: 0403

  Sound Server-1: ALSA v: k5.15.0-27-generic running: yes

  Sound Server-2: PulseAudio v: 15.99.1 running: yes

  Sound Server-3: PipeWire v: 0.3.48 running: yes

Network:

  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet

    vendor: QUANTA driver: r8169 v: kernel pcie: speed: 2.5 GT/s lanes: 1

    port: 4000 bus-ID: 08:00.0 chip-ID: 10ec:8168 class-ID: 0200

  IF: enp8s0 state: down mac: <filter>

  Device-2: Qualcomm Atheros AR9462 Wireless Network Adapter

    vendor: Foxconn driver: ath9k v: kernel pcie: speed: 2.5 GT/s lanes: 1

    bus-ID: 0f:00.0 chip-ID: 168c:0034 class-ID: 0280

  IF: wlp15s0 state: up mac: <filter>

Bluetooth:

  Device-1: Foxconn / Hon Hai type: USB driver: N/A bus-ID: 3-7:4

    chip-ID: 0489:e04e class-ID: e001

Drives:

  Local Storage: total: 707.97 GiB used: 487.1 GiB (68.8%)

  ID-1: /dev/sda vendor: Big Reservoir model: BR 240G size: 223.57 GiB

    speed: 3.0 Gb/s type: SSD serial: <filter> rev: 3B0 scheme: MBR

  ID-2: /dev/sdb vendor: HGST (Hitachi) model: HTS725050A7E630

    size: 465.76 GiB speed: 6.0 Gb/s type: HDD rpm: 7200 serial: <filter>

    rev: B550 scheme: MBR

  ID-3: /dev/sdc model: SATA SSD size: 18.64 GiB speed: 3.0 Gb/s type: SSD

    serial: <filter> rev: M018 scheme: MBR

Partition:

  ID-1: / size: 18.63 GiB used: 10.29 GiB (55.3%) fs: xfs dev: /dev/sdc1

  ID-2: /home size: 160.28 GiB used: 77.48 GiB (48.3%) fs: ext4

    dev: /dev/sda2

Swap:

  ID-1: swap-1 type: file size: 945.5 MiB used: 0 KiB (0.0%) priority: -2

    file: /swapfile

Sensors:

  System Temperatures: cpu: 56.0 C pch: 44.5 C mobo: N/A

  Fan Speeds (RPM): N/A

Info:

  Processes: 281 Uptime: 4h 56m wakeups: 1 Memory: 11.6 GiB

  used: 2.28 GiB (19.6%) Init: systemd v: 249 runlevel: 5 Compilers:

  gcc: 11.2.0 alt: 11 Packages: 1744 apt: 1735 snap: 9 Shell: Bash v: 5.1.16

  running-in: deepin-terminal inxi: 3.3.13

There is this file /lib/firmware/ar3k

$ du -h /lib/firmware/ar3k

36K    /lib/firmware/ar3k

There is no ar3k directory in Ubuntu 22.04 directory. I try to create this directory, and then execute sudo cp linux-firmware/ar3k/AthrBT_0x11020000.dfu /lib/firmware/ar3k. after restart, dmesg reports that a new file is missing：Patch file not found ar3k/ramps_0x11020000_40.dfu, and then I go to Google to find a copy. After restart, the error becomes like this

sudo dmesg |grep -i blue

[    4.444301] Bluetooth: Core ver 2.22

[    4.444340] NET: Registered PF_BLUETOOTH protocol family

[    4.444342] Bluetooth: HCI device and connection manager initialized

[    4.444348] Bluetooth: HCI socket layer initialized

[    4.444352] Bluetooth: L2CAP socket layer initialized

[    4.444357] Bluetooth: SCO socket layer initialized

[    8.285799] Bluetooth: Firmware loading err = -110, len = 448, size = 4096, count = 4470

[    8.285815] Bluetooth: Loading sysconfig file failed

[    9.639233] xfs filesystem being remounted at /run/systemd/unit-root/var/lib/bluetooth supports timestamps until 2038 (0x7fffffff)

[    9.685603] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

[    9.685607] Bluetooth: BNEP filters: protocol multicast

[    9.685611] Bluetooth: BNEP socket layer initialized

I download file at :https://github.com/cernekee/linux-firmware/blob/master/ar3k/ramps_0x11020000_40.dfu