[Bug 1490347] Re: [Regresision] 16:04 + 15:10 - Cannot pair with devices using (Legacy) PIN codes

[TJ]

@Sebastian: No, this isn't the same as bug #1492443 (which as I read it
is about failing to display the authentication prompt).

This particular bug has had me confused at times between symptoms of
that issue, another issue with a BT regression in the kernel that
affects some BT host adapters, and the issue here.

This issue affects mostly older 'original' Bluetooth devices (such as
the Apple Wireless Keyboard A1016) that do not support BT SSP
authentication but do support the original PIN-code LMP authentication
method.

In this issue the BT device is expecting and can only use LMP mode but
the host/bluez only supports SSP mode.

So a device supporting the SSP protocol can look to a user like it is
accepting a PIN-code especially if that is how the host's user interface
presents it, but the underlying protocol isn't the original BT LMP
protocol.

** Summary changed:

- [Regresision] 16:04 + 15:10 - Cannot pair with devices using (Legacy) PIN codes
+ [Regresision] 16:04 + 15:10 - Cannot pair with devices using (legacy LMP Link Management Protocol) PIN codes

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Title:
  [Regresision] 16:04 + 15:10 - Cannot pair with devices using (legacy
  LMP Link Management Protocol) PIN codes

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