Question

5

Bluetooth 5.0 adapter help

rated 0 times [ 5] [ 0] / answers: 1 / hits: 3595 / 1 Year ago, thu, december 22, 2022, 1:47:01

I just changed my 4.0 adapter for the new Bluetooth 5.0 adapter, but found out it doesn't work on Ubuntu. Can someone please help me and tell what steps exactly I need to follow to be able to make it work?

lsusb output:
Bus 001 Device 004: ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio

hciconfig -a:

    BD Address: 00:00:00:00:00:00  ACL MTU: 0:0  SCO MTU: 0:0

    DOWN 

    RX bytes:21 acl:0 sco:0 events:2 errors:0

    TX bytes:6 acl:0 sco:0 commands:2 errors:0

    Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

    Packet type: DM1 DH1 HV1 

    Link policy: 

    Link mode: SLAVE ACCEPT

hcitool dev is empty

bluetoothctl --version is bluetoothctl: 5.53

rfkill is:

ID TYPE      DEVICE      SOFT      HARD

 1 bluetooth hci0   unblocked unblocked

btmon is:

Failed to bind channel: Operation not permitted

What commands outputs else you want me to show here? Adapter is DEXP AT-BT501, chipset is RTL8761B. Ubuntu is 20.04 LTS.

UPD: Ubuntu mainline says my kernel is 5.13.0-37, the device is working, because it has no problem on Windows.

UPD2: Logs say Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found

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tigehanc

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answered 1 Year ago edseager · Accepted Answer

The binary for the RTL8761b is not currently part of the Linux kernel but, according to this Ubuntu Forums post, you can obtain it from a GitHub repository.

Here's how:

Open Terminal (if it's not already open)

Change to the temporary directory:
```
cd /tmp
```

Download the configuration and firmware files from GitHub:

wget https://raw.githubusercontent.com/Realtek-OpenSource/android_hardware_realtek/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_config

wget https://raw.githubusercontent.com/Realtek-OpenSource/android_hardware_realtek/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_fw

Move the appropriate files to your /lib/firmware/rtl_bt directory:

sudo mv rtl8761b_config /lib/firmware/rtl_bt/rtl8761b_config.bin

sudo mv rtl8761b_fw /lib/firmware/rtl_bt/rtl8761b_fw.bin

Run modprobe:
```
sudo modprobe btusb
```

Restart the Bluetooth service:
```
sudo systemctl start bluetooth.service
```

If everything is good, Bluetooth will now be operational. Running hciconfig -a will confirm whether the system can use the radio or not.