4.0 bluetooth-Cambridge Silicon Radio

[Freiklite]

Hi,
I use ubuntu 20.04 on notebook HP with a keyboard Logitech MK235. All is OK?

If I replace the original Bluetooth USB Key by a Qlive 4.0 Bluetooth USB Key nothing works.

The 4.0 bluetooth settings are they inappropriate for a keyboard Logitech MK235?
Or the other way around?

Thank very much for your attention,
Ciao



Some information:
Original Logitech Bluetooth USB Key

-HP-Laptop-14s-fq0xxx:~$ hciconfig
hci0:    Type: Primary  Bus: USB
    BD Address: 00:E9:3A:E9:C8:C2  ACL MTU: 1021:8  SCO MTU: 255:12
    UP RUNNING 
    RX bytes:1780 acl:0 sco:0 events:198 errors:0
    TX bytes:38691 acl:0 sco:0 commands:198 errors:0

Qlive 4.0 Bluetooth USB Key

HP-Laptop-14s-fq0xxx:~$ hciconfig
hci1:    Type: Primary  Bus: USB
    BD Address: 00:1A:7D:DA:71:13  ACL MTU: 310:10  SCO MTU: 64:8
    UP RUNNING 
    RX bytes:702 acl:0 sco:0 events:50 errors:0
    TX bytes:3174 acl:0 sco:0 commands:50 errors:0

hci0:    Type: Primary  Bus: USB
    BD Address: 00:E9:3A:E9:C8:C2  ACL MTU: 1021:8  SCO MTU: 255:12
    UP RUNNING 
    RX bytes:1780 acl:0 sco:0 events:198 errors:0
    TX bytes:38691 acl:0 sco:0 commands:198 errors:0

Various information:

HP-Laptop-14s-fq0xxx:~$ lspci -nnk | grep -iA2 net
01:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
    DeviceName: Realtek Wireless LAN + BT
    Subsystem: Hewlett-Packard Company RTL8821CE 802.11ac PCIe Wireless Network Adapter [103c:831a]
    Kernel driver in use: rtw_8821ce
    Kernel modules: rtw88_8821ce

HP-Laptop-14s-fq0xxx:~$ lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 009: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 003 Device 002: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0bda:b00a Realtek Semiconductor Corp. Realtek Bluetooth 4.2 Adapter
Bus 001 Device 002: ID 0408:5365 Quanta Computer, Inc. HP TrueVision HD Camera
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[Freiklite]

Hi,
Some information on my dongle Qlive:

Bus 003 Device 008: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

Please which another place?

https://askubuntu.com/questions/1335...d-ubuntu-20-04
I have solved the same problem.
Move the following to another place:
/lib/firmware/rtl_bt/rtl8761b_config.bin
/lib/firmware/rtl_bt/rtl8761b_fw.bin
Create links:
cd /lib/firmware/rtl_bt/
ln -s rtl8761bu_fw.bin rtl8761b_fw.bin
ln -s rtl8761bu_config.bin rtl8761b_config.bin

On my notebook:

$ locate rtl8761b_config
/usr/lib/firmware/rtl_bt/rtl8761b_config.bin

Ciao