Hi,
the output of git bisect log is
git bisect start
# status: waiting for both good and bad commits
# bad: [e2acc2211022246c77740d5df08265cc27eedcc5] Linux 6.12.111
git bisect bad e2acc2211022246c77740d5df08265cc27eedcc5
# status: waiting for good commit(s), bad commit known
# good: [f717995cb7dcd8998ab15516b8006aea09cfde0d] Linux 6.12.107
git bisect good f717995cb7dcd8998ab15516b8006aea09cfde0d
# bad: [2e3d827cd56865c14f6ca118bbccd7801091fb21] Bluetooth: hci_sync: free the
advertising instance on the failure and cancel paths
git bisect bad 2e3d827cd56865c14f6ca118bbccd7801091fb21
# bad: [ebc41dfc59d190956e0113e8bd90c28f6f21e8b9] scsi: qla2xxx: Bound
rsp_info_len to avoid OOB sense-data read
git bisect bad ebc41dfc59d190956e0113e8bd90c28f6f21e8b9
# bad: [af3ce383ba0d0d48957a22ac7058ff5698775898] power: supply:
charger-manager: register regulators before exposing sysfs
git bisect bad af3ce383ba0d0d48957a22ac7058ff5698775898
# good: [58bcdfb2b2e412088839ae740b1a95154dc0b8d0] nfsd: clear opcnt on
compound arg release to prevent OOB read
git bisect good 58bcdfb2b2e412088839ae740b1a95154dc0b8d0
# bad: [f4fde735a813705875e836e1dea41a93e994c779] Bluetooth: hci_conn:
re-enable advertising only for peripheral role
git bisect bad f4fde735a813705875e836e1dea41a93e994c779
# good: [b11a78646c104df205e7eb5903bcce7590396dea] eCryptfs: bound the
packet-length peek to the user buffer
git bisect good b11a78646c104df205e7eb5903bcce7590396dea
# good: [2ae970ad5adc254360b25d153956009a7d9ee8a2] ARM: 9477/1: Disable broken
eBPF JIT on the Risc PC
git bisect good 2ae970ad5adc254360b25d153956009a7d9ee8a2
# bad: [d66ceeefb87ddb097b0546bafc581380b816b048] dm-era: fix shadowed
superblock leak on take-snap failure
git bisect bad d66ceeefb87ddb097b0546bafc581380b816b048
# bad: [32412aff8d11d00672053cb10750869f2de94a1f] Bluetooth: btusb: Add ASUS
USB-BT600 for Realtek 8761CU
git bisect bad 32412aff8d11d00672053cb10750869f2de94a1f
# good: [fe7ba73dde94c5f413b1588cd444b49105015dda] auxdisplay: charlcd: cancel
backlight work on registration failure
git bisect good fe7ba73dde94c5f413b1588cd444b49105015dda
# bad: [f05baf6e0680d8c10d2fbbc5953848fc3e3db957] Bluetooth: btusb: Add ASUS
USB-BT540 for Realtek 8761CU
git bisect bad f05baf6e0680d8c10d2fbbc5953848fc3e3db957
# good: [48ca2b8c8a6ba5c26269120c8092db0b617a18a7] block: set QUEUE_FLAG_DYING
unconditionally in blk_mark_disk_dead()
git bisect good 48ca2b8c8a6ba5c26269120c8092db0b617a18a7
# first bad commit: [f05baf6e0680d8c10d2fbbc5953848fc3e3db957] Bluetooth:
btusb: Add ASUS USB-BT540 for Realtek 8761CU
On 30.09.26 16:58, Salvatore Bonaccorso wrote:
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
