[Bug 1491988] Re: 15.10: Multiple Bluetooth controllers not found

[TJ]

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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Title:
  15.10: Multiple Bluetooth controllers not found

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