kbd_idle_light

#!/bin/bash

dim_time=10 # time to wait before dimming the screen
now_idle=false # flag to indicate if user is currently idle
idle_brightness=0 # dimmed screen brightness to set when idle
brightness_file="/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight/brightness"
cpu_limit=10 # CPU limit, adjust as needed (10 = 10% of system CPU)

# Set the priority of the current script
renice "$cpu_limit" "$$"

while true; do
    # Fetch the idle time using gdbus
    idle_time=$(gdbus call --session --dest org.gnome.Mutter.IdleMonitor --object-path /org/gnome/Mutter/IdleMonitor/Core --method org.gnome.Mutter.IdleMonitor.GetIdletime | awk '{print $2/1000}')

    # Check if user has gone idle
    if (( $(awk -v idle="$idle_time" -v time="$dim_time" 'BEGIN{ print (idle >= time) }') )) && [ "$now_idle" = false ]; then
        # Save current brightness
        brightness_before=$(cat "$brightness_file")

        # Dim the screen
        echo "$idle_brightness" | tee "$brightness_file"
        now_idle=true
    # Check if user has become active
    elif (( $(awk -v idle="$idle_time" -v time="$dim_time" 'BEGIN{ print (idle < time) }') )) && [ "$now_idle" = true ]; then
        # Set brightness to the value before dimming
        echo "$brightness_before" | tee "$brightness_file"
        now_idle=false
    fi

    sleep 1
done