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Message-ID: <12c4c516-28d4-4f09-86de-5e424cf714f3@molgen.mpg.de>
Date: Sat, 16 Dec 2023 12:15:40 +0100
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To: Marcel Holtmann <marcel@holtmann.org>,
 Johan Hedberg <johan.hedberg@gmail.com>,
 Luiz Augusto von Dentz <luiz.dentz@gmail.com>
From: Paul Menzel <pmenzel@molgen.mpg.de>
Subject: Linux warns `HCI Enhanced Setup Synchronous Connection command is
 advertised, but not supported.`
Cc: linux-bluetooth@vger.kernel.org
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Dear Linux folks,


On a Dell XPS 13 9360 with

     ID 0cf3:e300 Qualcomm Atheros Communications QCA61x4 Bluetooth 4.0

Linux 6.6 warns:

     $ dmesg
     [    0.000000] microcode: updated early: 0xf0 -> 0xf4, date = 
2023-02-22
     [    0.000000] Linux version 6.6-amd64 
(debian-kernel@lists.debian.org) (gcc-13 (Debian 13.2.0-8) 13.2.0, GNU 
ld (GNU Binutils for Debian) 2.41.50.20231202) #1 SMP PREEMPT_DYNAMIC 
Debian 6.6.4-1~exp1 (2023-12-03)
     […]
     [    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 
06/02/2022
     […]
     [    0.456973] microcode: Microcode Update Driver: v2.2.
     […]
     [   27.179867] Bluetooth: hci0: HCI Enhanced Setup Synchronous 
Connection command is advertised, but not supported.
     […]

As a user, I do not know what to do about the warning. How can I adress 
it? Is that a firmware issue of the USB Bluetooth device, and should I 
contact them? It’d be great if the warning could contain that information.


Kind regards,

Paul