Ok, I tried again but changed the command with the version above to: make SUBLEVEL=0 EXTRAVERSION=-46-generic modules_prepare
Now I get in dmesg: [ 7851.540982] usb 10-1: new full-speed USB device number 4 using xhci_hcd [ 7851.788016] usb 10-1: New USB device found, idVendor=0a12, idProduct=0001, bcdDevice=88.91 [ 7851.788022] usb 10-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0 [ 7851.788026] usb 10-1: Product: CSR8510 A10 [ 7851.802391] usbcore: registered new interface driver btusb [ 7851.963660] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 7851.963662] Bluetooth: BNEP filters: protocol multicast [ 7851.963667] Bluetooth: BNEP socket layer initialized [ 7853.817073] Bluetooth: hci0: command 0x1001 tx timeout [ 7861.977389] Bluetooth: hci0: CSR: Local version failed (-110) seb@eragon:~/btDongleTest/linux-source-5.3.0[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:~/btDongleTest/linux-source-5.3.0[1]$ sudo hciconfig hci0 reset Can't init device hci0: Connection timed out (110) Otherwise behaviour is unchanged. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1873718 Title: CSR8510 based BTA-402 Bluetooth device cannot be started To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1873718/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs