bluetooth connect fails

[JPT]

I want to connect to a BT-serial adapter. Always get the error "Unknown command complete for opcode 37".

If I supply the correct pin, connection is reported successful, but the device immediately disappears.

I tried three different host BT hardware and two different PCs. always the same.

Kubuntu 14.04
Bluez-4.101-ubuntu13

syslog: First with correct pin, second using wrong pin:

bluetoothd[1107]: Discovery session 0x7f66d5221040 with :1.117 activated
bluetoothd[1107]: Unknown command complete for opcode 37
bluetoothd[1107]: Stopping discovery

bluetoothd[1107]: Discovery session 0x7f66d52209a0 with :1.118 activated
bluetoothd[1107]: Unknown command complete for opcode 37
bluetoothd[1107]: Stopping discovery
bluetoothd[1107]: hci0: Cancel Pair Device (0x001a) failed: Invalid Parameters (0x0d)

How do I enable more detailed logging?

I am quite sure this is no duplicate of those BT-suspend bugs. Because it always fails and the rfkill workaround doesn't help.

[JPT (j-p-t)]

Enabled debugging by adding -d to /etc/init/bluetooth.conf
But I don't understand what exactly is going on and why it fails.

I stripped pid, date (except secs) and hostname from log.

[JPT (j-p-t)]

Another log using different BT-dongle on host.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

apport-collect 1342568

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Launchpad Janitor (janitor)]

[Expired for bluez (Ubuntu) because there has been no activity for 60 days.]