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[82.192.247.196]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a18be97d1esm480991455e9.8.2026.10.12.10.28.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 10:28:23 -0700 (PDT) Sender: Salvatore Bonaccorso Received: by eldamar.lan (Postfix, from userid 1000) id 0CEB6DC09FD; Mon, 12 Oct 2026 19:28:23 +0200 (CEST) Date: Mon, 12 Oct 2026 19:28:22 +0200 From: Salvatore Bonaccorso To: Thorsten Leemhuis Cc: Sasha Levin , Marcel Holtmann , Luiz Augusto von Dentz , Greg Kroah-Hartman , Erik Brangs , benh@debian.org, stable@vger.kernel.org, regressions@lists.linux.dev, linux-bluetooth@vger.kernel.org, 1149377@bugs.debian.org Subject: Re: [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) Message-ID: References: <179104011040.2214689.5921682013387867802@eldamar.lan> <2026-10-04-1-daily-reply-0007-bt540-asus-firmware@kernel.org> <24ce058a-28b5-4499-9ded-eec9544b80ec@leemhuis.info> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <24ce058a-28b5-4499-9ded-eec9544b80ec@leemhuis.info> Ciao Thorsten, Thanks for looking into this regression as well. On Mon, Oct 12, 2026 at 02:00:18PM +0200, Thorsten Leemhuis wrote: > 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. If my understanding is correct from a earlier fixed regression in the ariea, aka https://lore.kernel.org/regressions/0fd8c1c9-7f56-4bcb-a727-e4386d8ef094@online.de/ should then not only 980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") be reverted, but as well along 6f0624b4427e ("Bluetooth: btusb: Add ASUS USB-BT600 for Realtek 8761CU") and as well 4a23ce935f74 ("Bluetooth: btrtl: Add the support for RTL8761CUV")? Regards, Salvatore