Control: tags -1 + moreinfo Hi Erik
On Tue, Sep 29, 2026 at 08:05:02PM +0200, Erik Brangs wrote: > Package: src:linux > Version: 6.12.111-1 > Severity: normal > X-Debbugs-Cc: [email protected], [email protected] > User: [email protected] > Usertags: amd64 > > Dear Maintainer, > > # * What led up to the situation? > I upgraded to the kernel 6.12.111 on my desktop computer. After the upgrade, > bluetooth no longer worked. > # * What exactly did you do (or not do) that was effective (or > # ineffective)? > > I rebooted the computer and selected the old kernel, 6.12.107, from the boot > menu. After booting the old kernel, bluetooth worked again. > # * What outcome did you expect instead? > > I would expect bluetooth to work with the current kernel. Yes understandable. It would be great if you could bisect the problem. That would involve compiling and testing a few kernels git clone --single-branch -b linux-6.12.y https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git cd linux-stable git checkout v6.12.107 cp /boot/config-$(uname -r) .config yes '' | make localmodconfig make savedefconfig mv defconfig arch/x86/configs/my_defconfig # test 6.12.107 to ensure this is "good" make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm problem does not exist # test 6.12.111 to ensure this is "bad" git checkout v6.12.111 make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm problem exists With that confirmed, the bisection can start: git bisect start git bisect good v6.12.107 git bisect bad v6.12.111 In each bisection step git checks out a state between the oldest known-bad and the newest known-good commit. In each step test using: make my_defconfig make -j $(nproc) bindeb-pkg ... install, verify if problem exists and if the problem is hit run: git bisect bad and if the problem doesn't trigger run: git bisect good . Please pay attention to always select the just built kernel for booting, it won't always be the default kernel picked up by grub. Iterate until git announces to have identified the first bad commit. Then provide the output of git bisect log In the course of the bisection you might have to uninstall previous kernels again to not exhaust the disk space in /boot. Also in the end uninstall all self-built kernels again. Regards, Salvatore
