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[Tony Espy <1551858@xxxxxxxxxxxxxxxxxx>]

And here's the trace for my xenial desktop running on a Thinkpad 410s.

** Attachment added: "btmon trace"
   https://bugs.launchpad.net/canonical-devices-system-image/+bug/1551858/+attachment/4593245/+files/xenial-desktop.cap

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https://bugs.launchpad.net/bugs/1551858

Title:
  [bluetooth] Connecting to Apple BT keyboard fails due to PIN prompt

Status in Canonical System Image:
  Confirmed
Status in bluez package in Ubuntu:
  New
Status in ubuntu-system-settings package in Ubuntu:
  New

Bug description:
  Connecting to the latest generation Apple BT keyboard ( the one with
  the USB port & no batteries ) fails on an Ubuntu Touch device, as when
  you press the "Connect" button on the device page, a dialog titled
  "Bluetooth Pairing Request" is displayed, with the following text:

  Please confirm that the PIN displayed on 'Magic Keyboard' matches this
  one: XXXXXX

  The dialog has "Cancel" and "Confirm PIN" buttons.

  The keyboard has no display on which a PIN could be displayed.

  When using other devices ( Ubuntu Desktop 15.10, 16.04, Android, OS X,
  ... ) to connect this keyboard all that's necessary is to click/press
  the 'Connect' button in the appropriate place, and the keyboard
  automatically connects, and is usable with no other actions required
  from the user.

  Reproduced on krillin ( rc-proposed/bq-aquris.en/270 ) which has bluez
  5.36-0ubuntu2~overlay1 installed.

  Reproduced on arale ( rc-proposed/meizu.en/258 ) which has bluez 5.37
  installed from silo 39.

  Note, after dismissing the dialog, subsequent attempts to connect may
  not re-display the PIN dialog, instead nothing happens.  I've found
  that this requires power cycling the keyboard to clear and cause the
  PIN dialog to be displayed again.

  [bluetooth]# show
  Controller B8:64:91:48:2B:1E
    Name: Aquaris E4.5 Ubuntu Edition
    Alias: Aquaris E4.5 Ubuntu Edition
    Class: 0x1c020c
    Powered: yes
    Discoverable: no
    Pairable: yes
    UUID: Headset AG                (00001112-0000-1000-8000-00805f9b34fb)
    UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
    UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
    UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
    UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
    UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
    UUID: Message Notification Se.. (00001133-0000-1000-8000-00805f9b34fb)
    UUID: Phonebook Access Server   (0000112f-0000-1000-8000-00805f9b34fb)
    Modalias: usb:v1D6Bp0246d0525
    Discovering: no

  [bluetooth]# devices
  Device 18:EE:69:21:6C:D3 18-EE-69-21-6C-D3
  Device DE:76:E2:04:9D:6F BB-9D6F
  Device 7C:D1:C3:1C:B4:03 7C-D1-C3-1C-B4-03
  Device 7C:D1:C3:19:2B:D8 7C-D1-C3-19-2B-D8
  Device 84:38:35:67:0C:3D ubuntu-0
  Device 04:69:F8:C2:A0:09 tony espy’s Keyboard
  Device 00:21:3C:A0:14:A6 Jawbone ERA
  Device 1C:1A:C0:B2:9A:D7 1C-1A-C0-B2-9A-D7

  Device info *before* pairing attempt:

  Device 04:69:F8:C2:A0:09
    Name: tony espy’s Keyboard
    Alias: tony espy’s Keyboard
    Class: 0x002540
    Icon: input-keyboard
    Paired: no
    Trusted: no
    Blocked: no
    Connected: no
    LegacyPairing: no
    Modalias: bluetooth:v004Cp0267d0066

  No changes in any of the attributes after *after* the pairing attempt
  ( output of info command is the same ).

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