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There are many models of bluetooth produced by realtek such as rtl8725,rtl8761,rtl8821.I have a usb blue adapter,i want to know which model is the bluetooth chip in bluetooth adapter?

sudo  dmesg | grep -i tooth
[    2.778424] usb 2-10: Product: Bluetooth Radio
[   10.918815] Bluetooth: Core ver 2.22
[   10.918832] Bluetooth: HCI device and connection manager initialized
[   10.918834] Bluetooth: HCI socket layer initialized
[   10.918836] Bluetooth: L2CAP socket layer initialized
[   10.918840] Bluetooth: SCO socket layer initialized
[   11.298374] rtk_btusb: Realtek Bluetooth USB driver ver 3.1.244af65.20200812-195650
[   19.222345] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   19.222346] Bluetooth: BNEP filters: protocol multicast
[   19.222350] Bluetooth: BNEP socket layer initialized
[   55.326843] Bluetooth: RFCOMM TTY layer initialized
[   55.326846] Bluetooth: RFCOMM socket layer initialized
[   55.326850] Bluetooth: RFCOMM ver 1.11

I collect some realtek bluetooth models from web:

rtl8723b_fw
rtl8723d_fw
rtl8723fs_fw
rtl8725as_fw
rtl8761a_fw
rtl8761at8192ee_fw
rtl8761b_fw
rtl8821a_fw
rtl8821c_fw
rtl8822b_fw
rtl8822cs_fw

Show my usb device:

lsusb 
Bus 003 Device 002: ID 8087:8000 Intel Corp. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 17ef:6019 Lenovo 
Bus 002 Device 006: ID 0d28:0204 NXP ARM mbed
Bus 002 Device 003: ID 2bdf:0284  
Bus 002 Device 005: ID 0bda:8771 Realtek Semiconductor Corp. 
Bus 002 Device 002: ID 046d:c31c Logitech, Inc. Keyboard K120
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

No model number 8771 in realtek's bluetooth chip.
How to get exactly which model it is.

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  • Run lsusb and you should have information about the chip.
    – Pilot6
    Jan 26, 2021 at 8:21
  • The model is 8761B
    – Pilot6
    Jan 26, 2021 at 8:38

2 Answers 2

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0

The model of your BT chip is 8761B.

If you are interested in firmware for this device, you need:

rtl8761b_fw.bin
rtl8761b_config

But these files have not been added to linux-firmware yet.

Source

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2
  • No 8761 as my command's output,it is your guess.
    – scrapy
    Jan 26, 2021 at 8:49
  • I don't guess. The PID of your device is 8771. It means that it is 8761B. I added a link to the kernel commit adding support for it.
    – Pilot6
    Jan 26, 2021 at 8:50
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since you are using usb adapter for Bluetooth, it must be [ 11.298374] rtk_btusb: Realtek Bluetooth USB driver ver 3.1.244af65.20200812-1956

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1
  • 1
    It is the driver version:3.1.244af65.20200812-1956 ,instead of bluetooth chip's model.
    – scrapy
    Jan 26, 2021 at 3:59

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