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Date:   Wed, 22 May 2019 08:38:12 +0200
From:   Marcel Holtmann <>
To:     Vasily Khoruzhick <>
Cc:     Johan Hedberg <>,
        "David S. Miller" <>,,,,
Subject: Re: [PATCH] Revert "Bluetooth: Align minimum encryption key size for
 LE and BR/EDR connections"

Hi Vasily,

> This reverts commit d5bb334a8e171b262e48f378bd2096c0ea458265.
> This commit breaks some HID devices, see [1] for details
> Signed-off-by: Vasily Khoruzhick <>
> Cc:

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?



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