How to configure sh handler for physical poweroff button?

Question

How to make sh script and run it when physical poweroff button is pressed? How to remove standard handler with user confirmation for this button?

Answer 1

To remove standard handler with user confirmation for poweroff button:

• Install dconf editor: sudo apt install -y dconf-cli dconf-editor
• Run dconf
• Set option /org/gnome/settings-daemon/plugins/power/power-button-action to nothing.
• To check its value in console: gsettings list-recursively org.gnome.settings-daemon.plugins.power | grep power-button-action
• Configuration for this setting will be stored in user home directory.

To set up physical poweroff button handler:

Create sh script:

• sudo touch /etc/acpi/poweroff.sh
• sudo chmod +x /etc/acpi/poweroff.sh
• sudo vim /etc/acpi/poweroff.sh
• Put to it the following content:

#!/bin/bash
LOG_FILE='/var/log/poweroff.log'
#touch $LOG_FILE && chmod 0666 $LOG_FILE
touch $LOG_FILE && chmod a=rw $LOG_FILE
echo "$(date '+%Y.%m.%d %H:%M:%S.%3N'): poweroff button pressed, event: $1" >> $LOG_FILE
sudo systemctl poweroff

For example, the following commands can be used for corresponding actions:

• sudo systemctl poweroff
• sudo systemctl suspend
• sudo systemctl hibernate
• sudo systemctl reboot

Create poweroff physical button event handler:

• sudo touch /etc/acpi/events/power
• sudo vim /etc/acpi/events/power
• Put to it the following content:

event=button/power LNXPWRBN
action=/etc/acpi/poweroff.sh "%e"

Apply changes:

• sudo /etc/init.d/acpid restart

When the button is pressed new line will be added to the log file

sudo less /var/log/poweroff.log

2022.02.24 02:14:55.322: poweroff button pressed, event: button/power PBTN 00000080 00000000
2022.02.24 02:14:55.327: poweroff button pressed, event: button/power LNXPWRBN:00 00000080 00000014

Related link: Disable shutdown confirmation for physical "Power off" button in the dash (Ubuntu 20.04)