How to configure acpid

2005-05-18T23:54:44Z

213.67.138.15: /* Example: go to sleep on lid close */

Basically, acpid just executes scripts residing in <tt>/etc/acpi/actions</tt>. Which script to launch at which event is configured in several files in <tt>/etc/acpi/events</tt>. {{cmd|man acpid}} holds detailed information on how to configure acpid.

The [[ibm-acpi]] package includes example scripts in the <tt>config</tt> folder inside the tarball. They are a good starting point to adjust them to your needs. You also might want to have a look at the [[Configs#ACPI | ACPI section of the Configs page]] or the [[:Category:Scripts|Scripts]] repository. And you can find information about the event strings [[ibm-acpi]] generates for certain keys at the [[How to get special keys to work#ibm-acpi_events | Special Keys HOWTO]].

==Example: go to sleep on lid close==

To make the ThinkPad go to sleep when you close the lid, you need to add
an event handler for the lid event and an action script that takes care
of going to sleep and resuming.

The event script needs to be created within <tt>/etc/acpi/events</tt> and can have any name you like.
In this case we call it lid because it will trigger the lid event. Do {{cmdroot|vi /etc/acpi/events/lid}} and make it look like this:
event=button/lid
action=/etc/acpi/actions/sleep.sh %e

The "event" line is a regular expression specifying the events we're
interested in. You can determine what the event strings are from looking at
<tt>/var/log/acpid</tt> after trying to suspend, close the lid, etc. .
You can find information about the event strings [[ibm-acpi]] generates for certain keys at the [[How to get special keys to work#ibm-acpi_events | Special Keys HOWTO]].

The "action" line is the command to be executed when these events are
dispatched. In this example we call the <tt>sleep.sh</tt> script residing in <tt>/etc/acpi/actions</tt> and pass the event description text using the %e placeholder.

{{NOTE|To make your changes take effect after adding or modifying the events files you must do a <tt>'''kill -SIGHUP `pidof acpid`'''</tt>}}.

Our example <tt>/etc/acpi/actions/sleep.sh</tt> script looks as follows:

#!/bin/sh

# if launched through a lid event and lid is open, do nothing
echo "$1" | grep "button/lid" && grep -q open /proc/acpi/button/lid/LID/state && exit 0

# sync filesystem and clock
sync
/sbin/hwclock --systohc

# switch to console
FGCONSOLE=`fgconsole`
chvt 6
/usr/sbin/radeontool light off

# go to sleep
echo -n "mem" > /sys/power/state

# readjust the clock (it might be off a bit after suspend)
/sbin/hwclock --adjust
/sbin/hwclock --hctosys

# turn on the backlight and switch back to X
radeontool light on
chvt $FGCONSOLE

The lid generates an event for both opening and closing thus requiring
that we check it's state and only act if it's closed.

Note that the <code>echo -n "mem" > /sys/power/state
</code> line does not return until we are revived. So there is
only one event generated and there is no need to check the state of
anything.

The console switching code in this script is a special solution for
[[Problem with LCD backlight remaining on during ACPI sleep|a problem where the backlight doesn't switch off]]
on the {{T30}} and some other models. Before going to sleep, these models switch to console mode which causes the
backlight to come back on. So we preemptively switch to console mode and turn off the backlight using [[radeontool]]
before going to sleep.

A problem encountered when trying to get suspend to work on X40 was that the display did not turn back on properly afterwards. The fix for this was to insert <tt>acpi_sleep=s3_bios</tt> into <tt>/boot/grub/menu.lst</tt>

Example:
title Debian GNU/Linux, kernel 2.6.11-1-686
root (hd0,0)
kernel /boot/vmlinuz-2.6.11-1-686 root=/dev/hda1 ro acpi_sleep=s3_bios
initrd /boot/initrd.img-2.6.11-1-686
savedefault
boot

I also encountered a problem with the USB-mouse not working properly after a resume from suspend. This was fixed by <tt>rmmod uhci_hcd</tt> in the suspend script followed by a <tt>modprobe uhci_hcd</tt> after the suspend.

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How to configure acpid