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 /etc/acpi/events and can have any name you like. In this case we call it lid because it will trigger the lid event. Do # vi /etc/acpi/events/lid and make it look like this:
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 /var/log/acpid after trying to suspend, close the lid, etc. . You can find information about the event strings ibm-acpi generates for certain keys at the Special Keys HOWTO.
The "action" line is the command to be executed when these events are dispatched. In this example we call the sleep.sh script residing in /etc/acpi/actions and pass the event description text using the %e placeholder.
For the script you can use the hibernate script of Tux On Ice (it is independent of the suspend-to-disk functionality), or any of many examples available on the web, such as the one below.
To make your changes take effect after adding or modifying the events files you must do a kill -SIGHUP `pidof acpid`
Our example /etc/acpi/actions/sleep.sh script looks as follows:
# 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
# remove USB 1.1 driver
# sync filesystem and clock
# switch to console
/usr/sbin/radeontool light off
# go to sleep
sleep 5 && echo -n "mem" > /sys/power/state
# readjust the clock (it might be off a bit after suspend)
# reload USB 1.1 driver
# turn on the backlight and switch back to X
radeontool light on
This parts of this script are now part of some distributions, like Debian Etch and you probably don't need to add this script. Look into /etc/acpi/lid.sh, for example.
The lid generates an event for both opening and closing thus requiring that we check its state and only act if it's closed.
There have been problems encountered with the USB devices not working properly after a resume from suspend. To circumvent those we remove the USB driver prior to suspend and reload it afterwards.
Note that the # echo -n "mem" > /sys/power/state 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 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.
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