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the hex stuff after ACPI in dmesg? yes then it is installed and is working wether it is configured properly and setup to run in an effective manner would still need to be determined
acpi command not installed? no it is not, but it only deals with getting and displaying information ... it doesnt really do anything.
ex. if you type acpi -v it will display
how to pass an event to acpid? You just have to do something that would cause an event. if you unplug your ac adapter it should get the event ac_adapter.ADP1
but that will only be effective if you have your events setup to properly handle events. In /etc/acpi check for event_handler.sh or something like that. And make sure you have an option to log everything
*.* logger group $1 / event $2 just happened
other events can be in there so like
something.* logger the pc just blew up
good.* logger the pc turned to gold
*.* logger group $1 / event $2 not a known event
$1 and $2 are just variables passed from the acpid they tell what just happened then in the event handler file you can set what to do. This is kinda of distro dependent; some distros set this up for you to some extent, some set it up completely, and some dont set it up at all.