acpid - 1:2.0.34-1+b1 main

Modern computers support the Advanced Configuration and Power Interface (ACPI)
to allow intelligent power management on your system and to query battery and
configuration status.
.
ACPID is a completely flexible, totally extensible daemon for delivering
ACPI events. It listens on netlink interface (or on the deprecated file
/proc/acpi/event), and when an event occurs, executes programs to handle the
event. The programs it executes are configured through a set of configuration
files, which can be dropped into place by packages or by the admin.