Shutdown Pressing Power Button

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Revision as of 16:55, 8 April 2010 by Ikaruga2099 (Talk | contribs) (qdbus doesn't work when run from acpi. Use PowerDevil instead)

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If you want to shutdown your system by simply pressing the power button, do the following:

  1. Install the acpid package.
  2. If there is no hal in the DAEMONS array in rc.conf, add acpid to the DAEMONS array.
  3. Create a file in /etc/acpi/events/ named power with following content:
# /etc/acpi/events/power
# This is called when the user presses the power button

event=button/power (PWR.||PBTN)

To be able to test it, make sure the acpid daemon is started

If you do not have hal, start the acpid daemon yourself:

# /etc/rc.d/acpid start

Otherwise restart hal, it will take care of acpid:

# /etc/rc.d/hal restart

From now on, pressing the power button (lightly, not for a few seconds) should properly shutdown the system. Note that if you have hibernate configured and working you may want to change the last line with:

Warning: Do not add the acpid daemon to the DAEMON array in "/etc/rc.conf" if hal is already there. You'll get an error message at boot when the computer tries to reload the already running acpi daemon.

If you're using a more sophisticated WM, you should use its own shutdown call, so it'd save its session etc.



Change the action (in /etc/acpi/events/power) to:

action=/opt/kde/bin/dcop --all-users --all-sessions ksmserver ksmserver logout 0 2 0


As of KDE 4.4, you can still use dcop as shown above.

Alternatively, you can use PowerDevil:

  1. Delete (or comment out) /etc/acpi/events/power.
  2. Open System Settings.
  3. Go to Advanced>>Power Management.
  4. Select "Edit Profiles" and choose the current profile. (In KDE 4.4, the default profile is "Powersave.")
  5. Select "Shutdown" as the action for "When power button is pressed."
  6. Press Apply.
Note: 1) With dcop and PowerDevil, the power button works only when KDE is running. Also, KDE needs to start from KDM (it probably also works when started from GDM). It does not work if you start KDE with a "startx" command.
Note: 2) The PowerDevil configuration is per user. To configure the power button for other users, repeat these steps for each user's account.

Todo: Add simple multi-user configuration steps.


For XFCE4.4 change the action line to:

action=echo POWEROFF | /usr/lib/xfce4/xfsm-shutdown-helper

Note: For a more robust solution (If you are facing frequent WM crashes or working on a sacrificial PC for developing or testing your software...), you should take a look at "/usr/src/linux/Documentation/sysrq.txt", which is a kernel facility for yielding you (the user...) the CPU so that it could be used for any rescue work.


Add a technique that works regardless of VM (Gnome/KDE/xcfe/openbox/etc). Copy the /etc/acpi/events/power script from Ubuntu