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Bug#1151860: linux-image-7.2.9+deb13-amd64: Regression in Realtek RTL8761BU (0bda:a728) Bluetooth LE scanning — request upstream fix backport

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Hi

On Fri, Oct 23, 2026 at 03:12:04PM -0700, Anna Smirnova wrote:
> Package: linux-image-7.2.9+deb13-amd64
> Version: 7.2.9-1~bpo13+1
> Severity: important
> Tags: upstream
> 
> Dear Debian Kernel Team,
> 
> I would like to report a reproducible Bluetooth regression affecting the
> Realtek RTL8761BU USB Bluetooth adapter (USB ID 0bda) on Debian 13 (Trixie)
> with the Linux 7.2.9 kernel from trixie-backports.
> 
> Hardware and software environment
> 
>    - Host: nyrok-pc-lnx
>    - Distribution: Debian GNU/Linux 13
>    - Affected kernel: 7.2.9+deb13-amd64
>    - Affected package: 7.2.9-1~bpo13+1
>    - Working kernel: 6.12.113+deb13-amd64
>    - BlueZ: 5.82-1.1
>    - Bluetooth adapter: Realtek RTL8761BU, USB 0bda
>    - Firmware: rtl_bt/rtl8761bu_fw.bin
>    - Firmware version: 0xdfc6d922
>    - Bluetooth peripheral: Logitech MX Mechanical, Bluetooth LE HID (046d)
>    - Connection topology: USB adapter directly connected to xHCI root hub
> 
> Observed behavior
> 
> On Linux 7.2.9, the Bluetooth controller intermittently stops responding.
> Following a system reboot, the Logitech MX Mechanical keyboard may fail to
> reconnect automatically.
> 
> Restarting the Bluetooth service temporarily restores normal operation.
> 
> The following errors were recorded in the kernel log on October 23, 2026:
> 
> Bluetooth: hci0: command 0x200c tx timeout
> Bluetooth: hci0: Resetting usb device.
> Bluetooth: hci0: Opcode 0x200c failed: -110
> Bluetooth: hci0: Unable to disable scanning: -110
> Bluetooth: hci0: Error when powering off device on rfkill (-110)
> 
> After the reset, the adapter reinitializes as hci1, reloads the same
> Realtek firmware, and the Logitech keyboard reconnects.
> 
> Regression confirmation
> 
> I installed and booted Debian’s 6.12.113 kernel on the same machine, using
> the same Bluetooth adapter and keyboard.
> 
> The issue does not reproduce with Linux 6.12.113. No Bluetooth pairing
> changes or hardware replacement were necessary.
> 
> Upstream investigation and proposed fix
> 
> This behavior closely matches the known RTL8761BU regression associated
> with HCI_QUIRK_BROKEN_EXT_SCAN.
> 
> The following upstream fix appears directly applicable:
> 
> Bluetooth: btusb: drop BROKEN_EXT_SCAN quirk for 0bda
> 
> Commit: fdd5964bd389936856971647fcac3442117009dc
> 
> https://git.kernel.org/bluetooth/bluetooth-next/c/fdd5964bd389
> 
> The patch was accepted into bluetooth-next on September 29, 2026.
> 
> A closely matching regression, including the same USB ID, firmware version
> and HCI timeout, is documented here:
> 
> https://github.com/pop-os/pop/issues/4135
> 
> Request
> 
> Could the Debian Kernel Team consider backporting the upstream fix to the
> Linux 7.2 packages used by trixie-backports, or confirm which upcoming
> Debian kernel package will include the correction?
> 
> I can provide additional kernel logs and test a patched kernel or btusb
> module if necessary.

The above commit hash is not valid, but there is a matching upstream
commit in mainline, df5e35f1663abc2702cf9f9e7eba024129ac5df1 .

Can you confirm that applying the attached patch (test it with out
debian/bin/test-patches script) fixes the issue?

Instructions: https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#id-1.6.6.4
Can you plese test that?

The commit is marked for stable, so will trickle in in net stable
series updates as well.

Regards,
Salvatore

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Bug#1151860: linux-image-7.2.9+deb13-amd64: Regression in Realtek RTL8761BU (0bda:a728) Bluetooth LE scanning — request upstream fix backport Salvatore Bonaccorso <carnil@debian.org> - 2026-10-24 17:20 +0200

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