Like Bluetooth dongle problem.(probably regarding the driver) I experience the same problem that the bluetooth device won't initialize properly:
$ lsusb | grep Bluetooth
Bus 001 Device 006: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
$ usb-devices | awk '/0a12/' RS=
T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#= 6 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=0a12 ProdID=0001 Rev=88.91
S: Product=USB1.1-A
C: #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I: If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
$ hciconfig -a hci0
hci0: Type: Primary Bus: USB
BD Address: 00:1A:7D:DA:71:11 ACL MTU: 679:9 SCO MTU: 48:16
DOWN
RX bytes:574 acl:0 sco:0 events:30 errors:0
TX bytes:368 acl:0 sco:0 commands:30 errors:0
Features: 0xff 0xff 0xc5 0xfa 0xdb 0xbf 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
$ hcidump
...
> HCI Event: Command Complete (0x0e) plen 12
Read Local Version Information (0x04|0x0001) ncmd 1
status 0x00
HCI Version: 4.0 (0x6) HCI Revision: 0x810
LMP Version: 4.0 (0x6) LMP Subversion: 0x1113
Manufacturer: Cambridge Silicon Radio (10)
...
> HCI Event: Command Complete (0x0e) plen 6
Delete Stored Link Key (0x03|0x0012) ncmd 1
status 0x11 deleted 0
Error: Unsupported Feature or Parameter Value
You will only see the last HCI Event for Error: Unsupported Feature or Parameter Value as long as you have not applied the patch. After the patch you wont see the event/command in the output of hcidump.
It works fine in Windows 10, but not in Ubuntu 18.04 (also not with kernel 5.3). Blueman is not recognizing the Bluetooth devices.
I get this when inserting the Bluetooth USB dongle:
jan 26 21:10:38 some-computer kernel: usb 1-1.3: new full-speed USB device number 6 using ehci-pci
jan 26 21:10:38 some-computer kernel: usb 1-1.3: config 1 interface 1 altsetting 0 endpoint 0x3 has wMaxPacketSize 0, skipping
jan 26 21:10:38 some-computer kernel: usb 1-1.3: config 1 interface 1 altsetting 0 endpoint 0x83 has wMaxPacketSize 0, skipping
jan 26 21:10:38 some-computer kernel: usb 1-1.3: New USB device found, idVendor=0a12, idProduct=0001, bcdDevice=88.91
jan 26 21:10:38 some-computer kernel: usb 1-1.3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
jan 26 21:10:38 some-computer kernel: usb 1-1.3: Product: USB1.1-A
jan 26 21:10:38 some-computer systemd[1]: Starting Load/Save RF Kill Switch Status...
jan 26 21:10:38 some-computer systemd[1]: Started Load/Save RF Kill Switch Status.
jan 26 21:10:38 some-computer systemd[1]: Reached target Bluetooth.
jan 26 21:10:38 some-computer upowerd[9037]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.1
jan 26 21:10:38 some-computer upowerd[9037]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0
jan 26 21:10:38 some-computer upowerd[9037]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3
jan 26 21:10:38 some-computer kernel: [UFW BLOCK] IN=eno1 OUT= MAC= SRC=<REMOVED from output by me!> DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=64 TC=0 HOPLIMIT=1 FLOWLBL=939113 PROTO=UDP SPT=8612 DPT=8612 LEN=24
I hope someone has a hint as what to do.
I have some supplemental information.
It is about this one: https://launchstudio.bluetooth.com/listingdetails/75270 And likely relevant chip(s) are: http://en.barrot.com.cn/a/BR80XX-series/48.html and http://en.barrot.com.cn/a/BR200Xxilie/12.html
Note: I was asked by @Pilot6 to create this as a separate question to avoid that my previous comments (added as an answer in the question referred to in the start) will get deleted.
Images found on the Internet that matches specific 'BQB 75270' LMP Subversions (identified by user):
LMP Subversion (a.l): 0x1113
LMP Subversion (BXL - product 3 in image below): 0x1712
LMP Subversions currently unknown for products 1 and 2 below.
Click for larger image:
