Further up in the same log I also found another code failure (XWayland
terminated then caused a JS exception)....
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[6550]: GNOME Shell started at
Fri Aug 08 2025 15:27:53 GMT+0100 (British Summer Time)
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[6550]: Registering session
with GDM
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[5744]: Connection to xwayland
lost
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[5744]: Xwayland terminated,
exiting since it was mandatory
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[5744]: JS ERROR:
Gio.IOErrorEnum: Xwayland exited unexpectedly
@resource:///org/gnome/shell/ui/init.js:21:20
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[5744]: Execution of main.js
threw exception: Module resource:///org/gnome/shell/ui/init.js threw an
exception
Aug 08 15:27:55 main-Precision-M6700 gsd-power[5920]: update_mutter_backlight:
assertion 'backlights != NULL' failed
Aug 08 15:27:55 main-Precision-M6700 gnome-shell[6550]: Launching DING process
Aug 08 15:27:55 main-Precision-M6700 gdm-launch-environment][5595]:
pam_unix(gdm-launch-environment:session): session closed for user gdm
Aug 08 15:27:55 main-Precision-M6700 systemd-logind[4111]: Session c1 logged
out. Waiting for processes to exit.
Aug 08 15:27:55 main-Precision-M6700 /usr/libexec/gdm-wayland-session[6210]:
discover_other_daemon: 1
Aug 08 15:27:55 main-Precision-M6700 xdg-desktop-por[7104]: Monitor 'Built-in
display' has no configuration which is-current!
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https://bugs.launchpad.net/bugs/2120182
Title:
Assertion fail when laptop lid closed.
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