Control: tags -1 + moreinfo Hi Audiot,
On Mon, Nov 02, 2026 at 11:57:22PM -0600, Audiot Norie wrote: > Package: src:linux > Version: 6.12.115-2 > Severity: normal > X-Debbugs-Cc: [email protected] > > Dear Maintainer, > > > After upgrading to kernel version 6.12.115+deb13.1-amd64 on Debian Stable, my > Behringer U-Phoria UMC404HD USB audio interface stopped working. > > - The device is physically detected by the USB bus and appears when running > 'lsusb'. > - I presume the snd-usb-audio module fails to bind/probe correctly. > - DMESG relevant log and LSUSB relevant details to follow. At first, that sounded like #1151339 but those changes were not backported introducing the problem there were not backported to the 6.12.y series. Can you please bisect the changes upstream with the following procedure so we can find the culprit change? 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 v6.12.113 cp /boot/config-$(uname -r) .config yes '' | make localmodconfig make savedefconfig mv defconfig arch/x86/configs/my_defconfig # test 6.12.113 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 6.12.115 to ensure this is "bad" git checkout v6.12.35 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 v6.12.113 git bisect bad v6.12.115 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
