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[Simon Fels <simon.busch@xxxxxxxxxxxxx>]

Because what pairing method is selected is chosen further down the stack
so settings only reacts on what bluez tells it should do. I suspect the
keyboard uses pairing capability KeyboardOnly which then should lead to
passkey entry where the initiator displays and the responder inputs the
PIN (we use KeyboardDisplay) [see Core spec 4.0 page 1968].

However the described dialog on your side is incorrect as it just asks
the user to confirm or cancel which could still be an settings app issue
just displaying the dialog but also an issue down the stack.

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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:
  New
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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