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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== Prerequisites ==
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First of all, make sure that {{ic|button}} module is loaded (check the output of {{ic|lsmod}}). If it is not, load it manually with {{ic|[[Kernel modules#Loading|modprobe]]}} and to load it automatically at boot time add it to your [[Rc.conf#Hardware|/etc/rc.conf]] {{ic|MODULES}} array.
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{{Note|Some machines only fire the power button acpi event after the power button is held down for some seconds, e.g. Thinkpads ~ 3 seconds.}}
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== First solution ==
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{{Accuracy}}
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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 and add {{ic|acpid}} to the {{ic|DAEMONS}} array in [[Rc.conf#Daemons|/etc/rc.conf]].
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#Create a file in {{ic|/etc/acpi/events/}} named {{ic|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 {{ic|acpid}} daemon is started or restart it if it is already launched, see [[Daemon]] for instructions. To test it without actually shutting down, comment out the {{ic|poweroff}} line and check your user/messages logs.
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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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If you are using a more sophisticated [[Window Manager]], you should use its own shutdown call, so it would save its session etc.
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=== KDE 3 ===
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Change the action in {{ic|/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 {{Ic|PowerDevil}}:
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# Delete (or comment out) {{Ic|/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|
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*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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*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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{{Expansion}}
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{{Box YELLOW|TODO|Add simple multi-user configuration steps.}}
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=== Xfce ===
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For Xfce 4.4 change the action line to:
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''action=echo POWEROFF | /usr/lib/xfce4/xfsm-shutdown-helper''
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For Xfce 4.8 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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#Add your user to group power {{ic|gpasswd -a [user] power}}
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#Install the [[acpid]] package and add {{ic|acpid}} to the {{ic|DAEMONS}} array in [[Rc.conf#Daemons|/etc/rc.conf]].
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#Edit {{ic|/etc/acpi/handler.sh}}:
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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 {{ic|acpid}} daemon is started, see [[Daemon]] for instructions. To test it without actually shutting down, comment out the {{ic|poweroff}} line and check your user/messages logs.
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Revision as of 08:17, 27 July 2013

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