Bug#1153424: mutter: meta_seat_native_reclaim_devices assertion failure and lost HID++ input via LightDM

[Carlos Guena]

Package: mutter
Version: 51.0-3
Severity: normal

Dear Maintainer,
In Debian Sid with mutter/gnome-shell 51.0-3, starting a GNOME Wayland
session
via LightDM or switching sessions triggers a seat device management failure
in
mutter's native backend.

Symptoms:
1. Wireless HID++ input devices (Logitech Unifying 046d:c52b and Logi Bolt
046d:c548)
   lose input focus and the mouse cursor becomes invisible, while standard
USB tablet
   devices remain functional.
2. Logging out of the broken GNOME session back to LightDM fails to cleanly
release
   DRM/seat devices, causing subsequent login attempts (even on a clean
test user or
   switching to KDE Plasma) to hang on an unresponsive black screen until a
full reboot.

Relevant journalctl log output during session startup/transition:
gnome-shell[13909]: ../../../gobject/gsignal.c:2674: handler '36' of
instance '0x55ac738b8f00' is not blocked
gnome-shell[13909]: meta_renderer_resume: assertion 'priv->is_paused' failed
gnome-shell[13909]: Spurious call to meta_seat_native_reclaim_devices()
without previous call to meta_seat_native_release_devices
gsd-xsettings[15571]: Failed to get current UI scaling factor:
GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name
"org.gnome.Mutter.X11" does not exist

Workaround found:
Switching the display manager from LightDM back to GDM3, performing a clean
reboot,
and avoiding background HID-polling conflicts at login restores normal seat
initialization.

-- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (100, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 7.3.3+deb14-amd64 (SMP w/24 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE
not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages mutter depends on:
ii  adwaita-icon-theme            51.0-1
ii  gnome-settings-daemon-common  51.0-2
ii  gsettings-desktop-schemas     51.0-2
ii  libc6                         2.43-7
ii  libglib2.0-0t64               2.90.1-2
ii  libmutter-51-0                51.0-3
ii  mutter-common                 51.0-3

mutter recommends no packages.

Versions of packages mutter suggests:
ii  gnome-control-center  1:51.1-2
ii  xdg-user-dirs         0.20-1

-- no debconf information

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