Difference between revisions of "Shutdown Pressing Power Button"

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[[Category:Power management (English)]]
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#REDIRECT [[Power Management]]
{{i18n|Shutdown Pressing Power Button}}
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First of all, make sure that "button" module is loaded (check the output of lsmod). If it's not, load it manually
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# modprobe button
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or add it to your [[Rc.conf#Hardware|/etc/rc.conf MODULES array]] so that it's automatically loaded at boot time.
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== First solution ==
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If you want to shutdown your system by simply pressing the power button, do the following:
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#Install the [[acpid]] package.
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#If there is no ''hal'' in the DAEMONS array in [[rc.conf]], add ''acpid'' to the DAEMONS array.
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#Create a file in ''/etc/acpi/events/'' named ''power'' with following content:
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# /etc/acpi/events/power
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# This is called when the user presses the power button
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event=button/power (PWR.||PBTN)
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action=/sbin/poweroff
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To be able to test it, make sure the acpid daemon is started
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If you do not have hal, start the acpid daemon yourself:
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# /etc/rc.d/acpid start
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Otherwise restart hal, it will take care of acpid:
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# /etc/rc.d/hal restart
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From now on, pressing the power button (lightly, not for a few seconds) should properly shutdown the system.
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Note that if you have '''hibernate''' configured and working you may want to change the last line with:
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action=/usr/sbin/hibernate
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{{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.}}
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If you're using a more sophisticated WM, you should use its own shutdown call, so it'd save its session etc.
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=== KDE 3 ===
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Change the action (in {{Codeline|/etc/acpi/events/power}}) to:
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action=/opt/kde/bin/dcop --all-users --all-sessions ksmserver ksmserver logout 0 2 0
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=== KDE 4 ===
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As of KDE 4.4, you can still use dcop as shown above.
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Alternatively, you can use {{Codeline|PowerDevil}}:
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# Delete (or comment out) {{Codeline|/etc/acpi/events/power}}.
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# Open System Settings.
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# Go to Advanced>>Power Management.
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# Select "Edit Profiles" and choose the current profile. (In KDE 4.4, the default profile is "Powersave.")
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# Select "Shutdown" as the action for "When power button is pressed."
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# Press Apply.
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{{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.}}
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{{Note|2) The PowerDevil configuration is ''per user''. To configure the power button for other users, repeat these steps for each user's account.}}
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'''Todo:''' Add simple multi-user configuration steps.
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=== XFCE ===
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For '''XFCE4.4''' change the action line to:
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''action=echo POWEROFF | /usr/lib/xfce4/xfsm-shutdown-helper''
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For '''XFCE4.8''' change the action line to:
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''action=echo POWEROFF | /usr/lib/xfce4/session/xfsm-shutdown-helper''
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'''''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.''
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== Second solution ==
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(First solution not working for me)
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# Install acpid.
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# If there is no hal in the DAEMONS array in rc.conf, add acpid to the DAEMONS array.
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# Edit /etc/acpi/handler.sh (as root):
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...
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case "$1" in
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    button/power)
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        #echo "PowerButton pressed!">/dev/tty5
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        case "$2" in
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            PWRF)  logger "PowerButton pressed: $2"
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    /sbin/poweroff;;
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            *)      logger "ACPI action undefined: $2" ;;
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        esac
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        ;;
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...
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To be able to test it, make sure the acpid daemon is started.
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If you do not have hal, start the acpid daemon yourself:
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# /etc/rc.d/acpid start
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Otherwise restart hal, it will take care of acpid:
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# /etc/rc.d/hal restart
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== TODO ==
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Add a technique that works regardless of VM (Gnome/KDE/xcfe/openbox/etc). Copy the {{Codeline|/etc/acpi/events/power}} script from Ubuntu
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Revision as of 08:17, 27 July 2013

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