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Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware)

From Thorsten Leemhuis <regressions@leemhuis.info>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware)
Date 2026-10-25 19:10 +0100
Message-ID <NSaPr-7PzO-173@gated-at.bofh.it> (permalink)
References (2 earlier) <NSaPr-7PzO-175@gated-at.bofh.it> <NSaPr-7PzO-177@gated-at.bofh.it> <NSaPr-7PzO-179@gated-at.bofh.it> <NIKr7-2zfo-7@gated-at.bofh.it> <NSaPr-7PzO-179@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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On 10/25/26 08:37, Christoph Zwerschke wrote:
> On 25.10.26 07:27, Thorsten Leemhuis wrote:
>> Feels wrong to me, as
>> Documentation/driver-api/firmware/firmware-usage-guidelines.rst says
>> "Users switching to a newer kernel should *not* have to install newer
>> firmware files to keep their hardware working.". So what those three
>> commits did in mainline even there could be considered a
>> mistake/regression. No worries, mistakes happen. And reverting it now in
>> mainline would do more damage than good. But overall it feels wrong to
>> bring that mistake over to older stable series.
> 
> I can confirm the analysis: [...]

Thx for taking the time explaining this in details to us, much appreciated!

> [...]
> Regarding your concern that a revert in mainline would do more damage
> than good: on 7.3 I also compared both variants (with and without the
> ID entries) with the BT600 for HFP and LE Audio (BlueZ 5.87, PipeWire
> 1.6.10). mSBC is negotiated and used even without the wide-band-speech
> flag, and I found no difference between ROM and loaded firmware. So
> for these two adapters I could not find any damage from reverting the
> ID entries in mainline. Of course this does not rule out that the
> loaded firmware contains fixes or improvements that my tests did not
> cover.
> [...] 
> If it helps, I can send reverts of 980084de4d9b and 6f0624b4427e
> (on top of bluetooth.git master, with Cc: stable). Alternatively,
> btrtl could fall back to the ROM firmware when rtl8761cu_fw.bin
> is missing.
I didn't see any regression reports for 7.x releases about those
changes, as I suspect that people that regularly switch to the latest
stable or mainline releases often update their firmware package, too. So
I'm still inclined to say: leave everything as it is in mainline to
avoid any risk and revert only the backports of those two in 6.18.y and
6.12.y.

Ciao, Thorsten

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Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Salvatore Bonaccorso <carnil@debian.org> - 2026-10-03 17:20 +0200
  Processed: [regression 6.12.y] After backport of 980084de4d9b  ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not  anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller  (requests firmware) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-10-03 17:20 +0200
  Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Sasha Levin <sashal@kernel.org> - 2026-10-04 18:40 +0200
    Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-10-12 17:40 +0200
      Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-10-13 11:10 +0200
        Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-10-23 15:50 +0200
          Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Sasha Levin <sashal@kernel.org> - 2026-10-24 22:30 +0200
            Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-10-25 19:10 +0100
              Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Sasha Levin <sashal@kernel.org> - 2026-10-26 00:40 +0100
                Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-11-02 12:20 +0100
                Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-11-02 12:20 +0100
            Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2026-10-25 19:10 +0100
              Bug#1149377: [regression 6.12.y] After backport of 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") bluethooth not anymore working on 0b05:1bef ASUSTek Computer, Inc. Bluetooth Controller (requests firmware) Thorsten Leemhuis <regressions@leemhuis.info> - 2026-10-25 19:10 +0100

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