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n00ki3
Asked: 2010-01-13 09:59:22 +0800 CST

How can i find the trigger of an acpi event?

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My Server shutsdown . Evertime at midnight.

The acpi Event power_button is triggered. at /etc/acpi/events/power_button
power_button:

# care about the power button
event=button/power.*
action=/usr/lib/acpid/power_button

How can i find out the "Caller" or the Trigger of this event ?

windows-event-log acpi

2 Answers

  1. power_button is a script, so all you need is to save executing backtrace from that script. The idea is to write a script that analyzes processes tree from launched power_button upwards and the caller process should be somewhere within.

    See this answer. Put the script into /usr/lib/acpid/power_button and save its output to a file: that should identify the offender unless the reason is not a data-center's cleaner guy :)

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  2. Depends exactly on your flavour of linux, but I've found this helpful in the past:

    /var/log/acpi.log

    Also using "lastcomm" to find the preceding processes.

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