The crash is mutter issue #4871, a regression from !5057, and
!5375 ("wayland/touch: Do not crash on empty focus surface") carries
the same NULL check as our patch. Say so in the overlay and the
patch, so it is clear when the patch can go.
Assisted-by: Claude:opus-5
meta_wayland_touch_cancel() clears focus_surface on active touches
but keeps their serials until the finger lifts. A client asking for
a move/resize grab with such a serial (anotherim-js's resize edges
by touch) makes touch_can_grab_surface() dereference NULL and takes
down gnome-shell (four crashes on 2026-10-13, same address).
Carry a one-line NULL check until nixpkgs' mutter has a fix; it is
not upstream as of mutter 50.2 / main.
Assisted-by: Claude:opus-5
acpi.ec_no_wakeup=1 stops EC interrupts from thrashing s2idle, and a
dconf system-db override disables gsd-power's sleep handlers so logind
owns all sleep/idle policy (gsd was re-waking before HibernateDelaySec).
Split lid/suspend policy by power source (s-t-h on battery, plain suspend
on AC), map power key to hibernate, drop HibernateDelaySec to 15min while
re-validating thermals, and disable USB-device wakeup via udev.
