Asus Screenpad Management service – Asus UX482EG

This post provides a script that can be used in conjunction with systemd to manage and restore the screenpad state when resuming from sleep on Asus laptops with a Screenpad installed.

This has been tested with the Asus UX482EG but it should work with other models.

Note that this requires that the package Asus WMI Screenpad is installed.

Screen Management Script

The script ran by the screenpad-sleeper.service:

#!/bin/sh

# Get the current brightness 0 indicates that it is offline
BRIGHTNESS_FILE="/var/tmp/screenpad_brightness"
BRIGHTNESS_SYS_FILE="/sys/class/leds/asus::screenpad/brightness"

store_brightness() {
    cat "$BRIGHTNESS_SYS_FILE" > "$BRIGHTNESS_FILE"
}

restore_brightness() {
    if [ -f "$BRIGHTNESS_FILE" ]; then
        STORED_BRIGHTNESS=$(cat "$BRIGHTNESS_FILE")
        if [ "$STORED_BRIGHTNESS" -gt 0 ]; then
            echo "$STORED_BRIGHTNESS" > "$BRIGHTNESS_SYS_FILE"
            screenpad $STORED_BRIGHTNESS
        else
            screenpad off
        fi
    rm "$BRIGHTNESS_FILE"
    else
        screenpad off
    fi
}

if [ "$1" = "pre" ]; then
    store_brightness
    screenpad off
elif [ "$1" = "post" ]; then
    restore_brightness
fi

The systemd service:

[Unit]
Description=Run helper on wake from sleep; restores screenpad state prior to sleep.
Before=systemd-suspend.service
StopWhenUnneeded=yes

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/local/bin/screenpad_wake_helper.sh pre
ExecStop=/usr/local/bin/screenpad_wake_helper.sh post

[Install]
WantedBy=sleep.target