Bug#1087940: linux-image-6.11.4-amd64: Bluetooth (Bluez) stops working with some peripherials with kernels after linux-image-6.11.2

[Joachim Bauernberger <joachim.bauernberger@protonmail.com>]

Package: linux-image-6.11.4-amd64
Severity: important
X-Debbugs-Cc: joachim.bauernberger@protonmail.com

Dear Maintainer,

with some peripherials (such as Marshall Stanmore III, or JBL external
speakers), previously sucessful paired (or connected) devices no longer
connect. 

The issue started after 6.11.2 (last working Debian kernel), and affects all
(currently/later) available amd64 kernel versions available in SID.

Output of btmon attached.

thanks,
Joachim


-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.11.9-amd64 (SMP w/16 CPU threads; PREEMPT)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8), LANGUAGE=en_CA:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-6.11.4-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.145
ii  kmod                                    33+20240816-2
ii  linux-base                              4.10.1

Versions of packages linux-image-6.11.4-amd64 recommends:
ii  apparmor  3.1.7-1+b3

Versions of packages linux-image-6.11.4-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  firmware-linux-free     20240610-1
ii  grub-efi-amd64          2.12-5
pn  linux-doc-6.11          <none>