/etc/acpi/events/panasonic-lockbtn is in acpi-support 0.140.
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 | # /etc/acpi/events/panasonic-lockbtn
# This is called when the user presses the lock button and calls
# /etc/acpi/screenblank.sh for further processing
event=pcc HKEY 00000080 00000088
action=/etc/acpi/screenblank.sh
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