Control: tags -1 + moreinfo Hi Staffan,
On Sat, Sep 06, 2025 at 04:36:55PM +0200, Staffan Melin wrote: > Package: src:linux > Version: 6.12.43-1 > Severity: important > X-Debbugs-Cc: staffan.me...@oscillator.se > > Dear Maintainer, > > *** Reporter, please consider answering these questions, where appropriate *** > > * What led up to the situation? I installed a clean Debian 13 > Stable/Trixie and the touchscreen on my GPD DUO worked. After doing a sudo > apt upgrade the kernel was upgraded from 6.12.38 to 6.12.43 and the > touchscreen stopped working. The touchscreen not working is on the upper > screen and is of make Jieli. > * What exactly did you do (or not do) that was effective (or > ineffective)? Booting again with kernel 6.12.38 made the touchscreen > work again. > * What was the outcome of this action? The newer kernel does not support > the Jieli touchscreen. > * What outcome did you expect instead? That the touchscreen continued > working. Thanks for reorting the issue. I have two questions: Can you please test the kernel from unstable and see if the problem persists there was well? If so this might indicate a upstream regression still present in mainline. Next, as this is a reegression in 6.12.38 to 6.12.43, can you bisect the changes? 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 v6.12.38 cp /boot/config-$(uname -r) .config yes '' | make localmodconfig make savedefconfig mv defconfig arch/x86/configs/my_defconfig # test 6.12.38 to ensure this is "good" make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm it successfully boots / problem does not exist # test 6.12.43 to ensure this is "bad" git checkout v6.12.43 make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm it fails to boot / problem exists With that confirmed, the bisection can start: git bisect start git bisect good v6.12.38 git bisect bad v6.12.43 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, try to boot / 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. Can you report back please? Regards, Salvatore