To disable fingerprint authentication when the laptop lid is closed, and re-enable when it is reopened, we will use acpid to bind to the button/lid.* event to a custom script that will stop and mask the fprintd service on lid close, and unmask and start the fprintd service on lid open.

We also check that the HDMI cable is connected by testing the contents of /sys/class/drm/card0-HDMI-A-1/status.

Follow the steps below:

1. Create file /etc/acpi/laptop-lid.sh with the following contents: #!/bin/bash lock=$HOME/fprint-disabled if grep -Fq closed /proc/acpi/button/lid/LID0/state && grep -Fxq connected /sys/class/drm/card0-HDMI-A-1/status then touch "$lock" systemctl stop fprintd systemctl mask fprintd elif [ -f "$lock" ] then systemctl unmask fprintd systemctl start fprintd rm "$lock" fi
2. Make the file executable with chmod +x /etc/acpi/laptop-lid.sh
3. Create file /etc/acpi/events/laptop-lid with the following contents: event=button/lid.* action=/etc/acpi/laptop-lid.sh
4. Restart the acpid service with: sudo service acpid restart

Now the fingerprint will be used only when the lid is open.

In order to restore the correct state of the fprintd service if you disconnect/reconnect while the laptop is off, you may call the above script from a systemd init file. The steps to do this are the following:

1. Create a file named /etc/systemd/system/laptop-lid.service with the following contents: [Unit] Description=Laptop Lid After=suspend.target [Service] ExecStart=/etc/acpi/laptop-lid.sh [Install] WantedBy=multi-user.target WantedBy=suspend.target
2. Reload the systemd config files with sudo systemctl daemon-reload
3. Start the service with sudo systemctl start laptop-lid.service
4. Enable the service so that it starts automatically on boot sudo systemctl enable laptop-lid.service

Now the status should be correct even after connecting/disconnecting when the computer is off.

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