This file is indexed.

/etc/acpi/events/thinkpad-cmos is in acpi-support 0.142-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# /etc/acpi/events/thinkpad-cmos
# This is called when ever an ACPI interupt comes in;  we
# use it to perform a (more intelligent) event-driven form
# of polling for Thinkpad hotkey status.

event=METHOD CMOS|UCMS|CMS 00000000 00000000
action=/usr/sbin/thinkpad-keys --update