Control: affects -1 src:nvidia-graphics-drivers On Thu, Oct 22, 2026 at 9:01 PM Claudio Giordano <[email protected]> wrote: > > Package: mutter > Version: 51.0-3 > Severity: serious > > Dear maintainers, > > after upgrading mutter and gnome-shell to 51.0-3 (Debian sid, 2026-10-22), > GDM can no longer start a greeter and the GNOME session crashes at startup > on a system using the proprietary NVIDIA driver shipped in testing/sid > (550.163.01-5.1). > > Symptoms > > - gdm retries until "GdmLocalDisplayFactory: maximum number of display > failures reached. Giving up." > - gnome-shell[3916]: segfault at ... ip ... sp ... error 4 in > libmutter-cogl-51.so.0.0.0[5faf4] > - [email protected]: Main process exited, code=killed, > status=11/SEGV > - GdmDisplay: Session never registered, failing > > Reproduction (deterministic, without GDM) > > $ gnome-shell --headless --mode=user; echo $? > 139 > $ gnome-shell --headless --mode=gdm; echo $? > 139 > > strace shows the NVIDIA EGL/GBM stack being loaded (renderD129, > nvidia-drm_gbm.so, libEGL_nvidia.so) followed by SIGSEGV. The faulting > offset 0x5faf4 corresponds to cogl_renderer_is_hardware_accelerated(), > which dereferences a NULL renderer. Upstream mutter 51 removed support for > legacy NVIDIA drivers (NEWS 51.alpha, MR !5079); whether 550 counts as > legacy is unclear, but mutter should not segfault when renderer/EGL > initialization fails. > > System > > - Debian sid/testing (forky), kernel 7.1.13+deb14-amd64 > - mutter 51.0-3, gnome-shell 51.0-3, gdm3 51.1-1 > - nvidia-driver 550.163.01-5.1, GeForce RTX 3070 Ti Laptop GPU > - Downgrading mutter/gnome-shell to 50.5-1 (testing) makes GNOME work again > > Impact > > 550.163.01 is the newest nvidia-driver in testing and sid; 555.58.02 has > been in experimental since 2024. When mutter 51 migrates to testing, GNOME > will be unusable for users of the packaged NVIDIA driver. > > Please consider: > > 1. keeping mutter 51 out of testing until a compatible driver is > available, or > 2. adding a versioned Breaks/Conflicts against nvidia-driver (<< 555) so > apt cannot install the broken combination, and/or > 3. fixing the NULL dereference so an EGL failure degrades gracefully > instead of killing gnome-shell. > > Thanks, > Claudio Giordano
Did you try the nvidia drivers from Experimental? Thank you, Jeremy Bícha
