I believe I've identified the root-cause:
$ hciconfig hci1 features
hci1: Type: BR/EDR Bus: USB
BD Address: 00:10:7A:4D:15:33 ACL MTU: 672:8 SCO MTU: 255:255
Features: 0xff 0xfb 0x01 0x00 0x00 0x00 0x00 0x00
<3-slot packets> <5-slot packets> <encryption> <slot offset>
<timing accuracy> <role switch> <hold mode> <sniff mode>
<park state> <RSSI> <SCO link> <HV2 packets> <HV3 packets>
<u-law log> <A-law log> <CVSD>
$ hciconfig hci1 commands
Can't read support commands on hci1: Input/output error (5)
I enabled dynamic_debug to get the BT_DBG() output:
echo 'file drivers/bluetooth/* +p' | sudo tee
/sys/kernel/debug/dynamic_debug/control
echo 'file net/bluetooth/* +p' | sudo tee
/sys/kernel/debug/dynamic_debug/control
The attached extract is from the kernel log when connecting the external
USB Bluetooth device.
** Attachment added: "kern.log with captured BT_DBG() a.k.a. pr_debug()"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1491988/+attachment/4460097/+files/kern.log
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https://bugs.launchpad.net/bugs/1491988
Title:
15.10: Multiple Bluetooth controllers not found
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