/etc/acpi/events/thinkpad-cmos is in acpi-support 0.142-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # /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
|