Introduction to acpid

The acpid (Advanced Configuration and Power Interface event daemon) is a completely flexible, totally extensible daemon for delivering ACPI events. It listens on netlink interface 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 user.



Development versions of BLFS may not build or run some packages properly if dependencies have been updated since the most recent stable versions of the book.

Package Information

User Notes:

Installation of acpid

Install acpid by running the following commands:

./configure --prefix=/usr \
            --docdir=/usr/share/doc/acpid-2.0.34 &&

This package does not come with a test suite.

Now, as the root user:

make install                         &&
install -v -m755 -d /etc/acpi/events &&
cp -r samples /usr/share/doc/acpid-2.0.34

Configuring acpid

acpid is configured by user defined events. Place event files under /etc/acpi/events directory. If an event occurs, acpid recurses through the event files in order to see if the regex defined after "event" matches. If they do, action is executed.

The following brief example will suspend the system when the laptop lid is closed (it requires pm-utils-1.4.1):

cat > /etc/acpi/events/lid << "EOF"

cat > /etc/acpi/ << "EOF"
/bin/grep -q open /proc/acpi/button/lid/LID/state && exit 0
chmod +x /etc/acpi/

Unfortunately, not every computer labels ACPI events in the same way. To determine how your buttons are recognized, use the acpi_listen tool. Also, look in the samples directory under /usr/share/doc/acpid-2.0.34 for more examples.

Boot Script

To automatically start acpid when the system is rebooted, install the /etc/rc.d/init.d/acpid boot script from the blfs-bootscripts-20230101 package.

make install-acpid


Installed Programs: acpid, acpi_listen, and kacpimon
Installed Libraries: None
Installed Directories: /etc/acpi and /usr/share/doc/acpid-2.0.34

Short Descriptions


is a program that listens for ACPI events and executes the rules that match the received event


is a simple tool which connects to acpid and listens for events


is a monitor program that connects to three sources of ACPI events (events file, netlink and input layer) and then reports on what it sees while it is connected