XPost: linux.debian.kernel   
   From: carnil@debian.org   
      
   Control: tags -1 + moreinfo   
      
   On Thu, Feb 19, 2026 at 10:36:57AM +0200, stanislav wrote:   
   > Package: linux-image-6.12.69+deb13-amd64   
   > Version: 6.12.69-1   
   > Severity: important   
   >   
   > After upgrading from kernel 6.12.63+deb13-amd64 to 6.12.69+deb13-amd64,   
   > the system boots to a black screen with no Wayland/KDE Plasma session   
   starting.   
   >   
   > Hardware: Intel Meteor Lake-P [Intel Arc Graphics] (PCI ID 7d55, rev 08)   
   > Driver: xe (with force_probe=7d55)   
   > Desktop: KDE Plasma Wayland (kwin_wayland)   
   >   
   > Kernel 6.12.63+deb13-amd64 works correctly with the same configuration.   
   > Kernel 6.12.69+deb13-amd64 results in a completely black screen after boot.   
   >   
   > Kernel parameters:   
   >   xe.enable_psr=0 xe.enable_panel_replay=0 xe.enable_fbc=0   
   >   xe.enable_dc=0 xe.enable_sagv=0 xe.enable_dpt=0 xe.psr_safest_params=1   
   >   
   > modprobe.d configuration:   
   >   options xe force_probe=7d55   
   >   blacklist i915   
   >   
   > The firmware package firmware-intel-graphics 20250410-2 is installed.   
      
   Can you please provide a full kernel log with booting 6.12.69-1 with   
   the black screens?   
      
   Can you please test if the problem persists with 6.12.73-1 as released   
   via trixie-security?   
      
   Additionally, if the issue is still reproducible with 6.12.73-1, can   
   you please bisect the changes between 6.12.63-1 and 6.12.69-1 to   
   identify the problem? If you can do that will 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 v6.12.63   
       cp /boot/config-$(uname -r) .config   
       yes '' | make localmodconfig   
       make savedefconfig   
       mv defconfig arch/x86/configs/my_defconfig   
      
       # test 6.12.63 to ensure this is "good"   
       make my_defconfig   
       make -j $(nproc) bindeb-pkg   
       ... install the resulting .deb package and confirm the problem does not   
   exist   
      
       # test 6.12.69 to ensure this is "bad"   
       git checkout v6.12.69   
       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 v6.12.63   
       git bisect bad v6.12.69   
      
   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   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)