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SubjectRe: [PATCH] Revert "Bluetooth: Align minimum encryption key size for LE and BR/EDR connections"
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Hi Vasily,

>> This reverts commit d5bb334a8e171b262e48f378bd2096c0ea458265.
>>
>> This commit breaks some HID devices, see [1] for details
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=203643
>>
>> Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
>> Cc: stable@vger.kernel.org
>
> let me have a look at this. Maybe there is a missing initialization for older HID devices that we need to handle. Do you happen to have the full btmon binary trace from controller initialization to connection attempt for me?
>
> Are both devices Bluetooth 2.1 or later device that are supporting Secure Simple Pairing? Or is one of them a Bluetooth 2.0 or earlier device?

I am almost certain that you have a Bluetooth 2.0 mouse. I made a really stupid mistake in the key size check logic and forgot to bind it to SSP support. Can you please check the patch that I just send you.

https://lore.kernel.org/linux-bluetooth/20190522070540.48895-1-marcel@holtmann.org/T/#u

Regards

Marcel

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