That's only supported for backward compatibility with the old Ubuntu laptop-mode package. It contains a setting using which you can enable or disable laptop mode entirely.
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Meaning that file can well be removed after all now, and l-m-t can stop looking for it.
Configuration is done in /etc/laptop-mode/laptop-mode.conf .
OTOH from the l-m-t FAQs:
And what about /etc/default/ laptop- mode?
That's only supported for backward compatibility with the old Ubuntu laptop-mode package. It contains a setting using which you can enable or disable laptop mode entirely.
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Meaning that file can well be removed after all now, and l-m-t can stop looking for it.
Configuration is done in /etc/laptop- mode/laptop- mode.conf .