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Look through dconf-editor and gnome-tweak-tool, maybe you'll find something useful there.

Here are docs for module that controls lid sensor: https://www.kernel.org/doc/Documentation/laptops/thinkpad-acpi.txt

Maybe acpitool -W x (get x from devices acpitool -w lists) can disable this sensor, though it's intended for controlling suspend/wake up.

If it has never worked as intended or it regressed, report a bug