Public bug reported:

kernel : 4.2.0-27
onboard bluetooth controller : AR3011
The Bluetooth was working great. I deactivated the bluetooth via the indicator, 
and then, impossible to start it. Neither from the settings bluetooth 
interface, neither via hciconfig. The service was of course started without 
problems.
The device was well recognized and started, could find which usb port and 
everything. However hciconfig could not see it:

$ hciconfig -a hci0                                                             
                                                                                
                                                                           
hci0:   Type: BR/EDR  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:12 acl:0 sco:0 commands:4 errors:0

Of course I restarted the system, tried purging all bluetooth related packages, 
tried installing blueman. Nothing would make it start.
Finally I found this thread of arch linux :
https://bbs.archlinux.org/viewtopic.php?id=171357

So basically I shut down the computer, waited a while, started the computer and 
the bluetooth is functional again.
I will try reproducing the bug. I tried, but it did not happen again. Maybe 
it's because I was listening music, lost signal, came back to the pc and closed 
bluetooth.

Any thoughts of what is this caused by?

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ar3011 bluetooth bluez hciconfig

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https://bugs.launchpad.net/bugs/1541392

Title:
  AR3011 Bluetooth not starting after being stoped (but detected)

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