Sorry for the delay. I have just installed 20.04 to try but the
behaviour is the same.
Dmesg log when I plug in the dongle:
[ 230.119651] usb 10-1: new full-speed USB device number 3 using xhci_hcd
[ 230.375357] usb 10-1: New USB device found, idVendor=0a12, idProduct=0001,
bcdDevice=88.91
[ 230.375362] usb 10-1: New USB device strings: Mfr=0, Product=2,
SerialNumber=0
[ 230.375365] usb 10-1: Product: CSR8510 A10
[ 230.479445] Bluetooth: Core ver 2.22
[ 230.479465] NET: Registered protocol family 31
[ 230.479466] Bluetooth: HCI device and connection manager initialized
[ 230.479470] Bluetooth: HCI socket layer initialized
[ 230.479472] Bluetooth: L2CAP socket layer initialized
[ 230.479475] Bluetooth: SCO socket layer initialized
[ 230.504741] usbcore: registered new interface driver btusb
[ 230.672496] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 230.672497] Bluetooth: BNEP filters: protocol multicast
[ 230.672501] Bluetooth: BNEP socket layer initialized
In the settings screen for BT it shows "BT Turned Off". When flip the
switch nothing happens.
seb@eragon:~[0]$ hciconfig
hci0: Type: Primary Bus: USB
BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
DOWN
RX bytes:0 acl:0 sco:0 events:0 errors:0
TX bytes:0 acl:0 sco:0 commands:1 errors:1
seb@eragon:~[1]$ sudo hciconfig hci0 reset
Can't init device hci0: Connection timed out (110)
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https://bugs.launchpad.net/bugs/1873718
Title:
CSR8510 based BTA-402 Bluetooth device cannot be started
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