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	2026-10-12 17:40 +0200
Message-ID	<NNqi6-561u-5@gated-at.bofh.it> (permalink)
References	<NK9GN-3kdQ-1@gated-at.bofh.it> <NKxpL-3wZE-7@gated-at.bofh.it> <NIKr7-2zfo-7@gated-at.bofh.it> <NKxpL-3wZE-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On 10/4/26 18:29, Sasha Levin wrote:
>> In Debian Erik Brangs reported that after the update from 6.12.107 to
>> 6.12.111, specifically with the backport of 980084de4d9b ("Bluetooth:
>> btusb: Add ASUS USB-BT540 for Realtek 8761CU") Bluetooth is not
>> anymore working, the full report is found at
>> https://bugs.debian.org/1149377 .
>>
>> | [   38.138881] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761cu_fw not found
> 
> The stable code matches mainline. The failure is a missing firmware file:
> rtl_bt/rtl8761cu_fw.bin has been in linux-firmware only since 20251111,
> and Debian trixie's firmware-realtek 20250410-2 does not have it.
> 
> Marcel, Luiz: could you, or Christoph Zwerschke as the author of the ID
> commit, send an upstream revert, or a fallback to ROM firmware when
> rtl8761cu_fw.bin is missing? Stable will take it for 7.2, 6.18 and 6.12
> through the normal Cc: stable route once it is in mainline.

Hmmm, that was a week (granted: with the LPC) ago and nothing happened.
Anyone working on this?

If not: Should we revert 980084de4d9b and its backports? Or only the
backports to older stable series?

Strictly speaking it should be the former due to our policies wrt to
firmware -- but I guess most users of a more recent kernels also have a
newer firmware, so I wonder if reverting the change might do more harm
then good now.

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

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