Ubuntu – How to shut down Lubuntu immediately with the power button instead of a logout method dialog prompt

lubuntupower-managementshutdown

I would like the computer to shut down directly after I press the power button. At the moment, Lubuntu opens a shutdown method dialog box when I press the shutdown button.

I suspect I can simply modify the Lubuntu-rc.xml file in the .config/openbox/ folder. I used that file to easily change other shortcut keys. If this is the case, I believe I have found the proper line of code where the shutdown command should be. But when I enter the command "sudo shutdown – now" in the appropriate place, it doesn't work. Is there another command I should enter for the physical power button to shutdown the computer immediately?

`<!-- Launch logout when push on the shutdown button -->
<keybind key="XF86PowerOff">
  <action name="Execute">
    <command>lxsession-default quit</command>
  </action>
</keybind>`

Best Answer

This is a configurable option in the XFCE Power Manager, which was installed by default in my relatively fresh Lubuntu 14.04.1 installation (a laptop). I found it at Preferences > Power Manager. If it's not installed already for you, you should be able to install it with sudo apt-get install xfce4-power-manager

In "General Options", you'll want to select "When power button is pressed: Shutdown" (default setting is "Ask" - which brings up the popup menu you want to skip). See the starred line in the image below.

Xfce Power Manager General Options screen with power button setting indicated by red stars.

I needed to log out of Lubuntu and log back in for this setting to take effect, but after that, one press of the power button shut down my system.

Hope this works for you!

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Ubuntu – How to modify the options for the power button

Lid Close Action

To set up the Laptop Lid Close Action you have to install Advanced Setting (or the Gnome Tweak Tool). It is in the USC (Ubuntu Software Center) under either tweak or Advanced Settings. If installed press the super button and type in tweak or advanced and choose the Advanced Settings. When it opens choose the shell tab;

Advanced Settings Before

Press the arrows and choose you desired on both on AC and on battery;

Advanced Setting After

Default buttons behavior

Install dconf-tools:

sudo apt-get install dconf-tools

Press alt+f2 and open dconf-editor (or in a terminal type dconf-editor)

Navigate to org.gnome.settings-daemon.plugins.power and set your default button-power action there:

enter image description here

On some systems you will also need to mark the item suppress-logout-restart-shutdown.

Ubuntu – Laptop power button not working

Install acpi and acpi-support, if not already installed.

Go to /etc/acpi/events.
There should be a file named powerbtn (if not, make it). The contents of the file in my installation are:

# /etc/acpi/events/powerbtn
# This is called when the user presses the power button and calls
# /etc/acpi/powerbtn.sh for further processing.

# Optionally you can specify the placeholder %e. It will pass
# through the whole kernel event message to the program you've
# specified.

# We need to react on "button power.*" and "button/power.*" because
# of kernel changes.

event=button[ /]power
action=/etc/acpi/powerbtn.sh

You can associate an action with the powerbutton by editing the action variable in this file.
In my installation, the contents of /etc/acpi/powerbtn.sh are:

#!/bin/sh
# /etc/acpi/powerbtn.sh
# Initiates a shutdown when the power putton has been
# pressed.

[ -r /usr/share/acpi-support/power-funcs ] && . /usr/share/acpi-support/power-funcs

# getXuser gets the X user belonging to the display in $displaynum.
# If you want the foreground X user, use getXconsole!
getXuser() {
        user=`pinky -fw | awk '{ if ($2 == ":'$displaynum'" || $(NF) == ":'$displaynum'" ) { print $1; exit; } }'`
        if [ x"$user" = x"" ]; then
                startx=`pgrep -n startx`
                if [ x"$startx" != x"" ]; then
                        user=`ps -o user --no-headers $startx`
                fi
        fi
        if [ x"$user" != x"" ]; then
                userhome=`getent passwd $user | cut -d: -f6`
                export XAUTHORITY=$userhome/.Xauthority
        else
                export XAUTHORITY=""
        fi
        export XUSER=$user
}

# Skip if we just in the middle of resuming.
test -f /var/lock/acpisleep && exit 0

# If the current X console user is running a power management daemon that
# handles suspend/resume requests, let them handle policy This is effectively
# the same as 'acpi-support's '/usr/share/acpi-support/policy-funcs' file.

[ -r /usr/share/acpi-support/power-funcs ] && getXconsole
PMS="gnome-settings-daemon kpowersave xfce4-power-manager"
PMS="$PMS guidance-power-manager.py dalston-power-applet"

if pidof x $PMS > /dev/null; then
        exit
elif test "$XUSER" != "" && pidof dcopserver > /dev/null && test -x /usr/bin/dcop && /usr/bin/dcop --user $XUSER kded kded loadedModules | grep -q klaptopdaemon; then
        exit
elif test "$XUSER" != "" && test -x /usr/bin/qdbus; then
        kded4pid=$(pgrep -n -u $XUSER kded4)
        if test "$kded4pid" != ""; then
                dbusaddr=$(su - $XUSER -c "grep -z DBUS_SESSION_BUS_ADDRESS /proc/$kded4pid/environ")
                if test "$dbusaddr" != "" && su - $XUSER -c "export $dbusaddr; qdbus org.kde.kded" | grep -q powerdevil; then
                        exit
                fi
        fi
fi

# If all else failed, just initiate a plain shutdown.
/sbin/shutdown -h now "Power button pressed"

Best Answer

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