KDE+Linux: Set all displays to max brightness when resuming from sleep

max_brightness_on_wakeup.py

#!/usr/bin/env python

import dbus
import dbus.mainloop.glib
import gi
from gi.repository import GLib

# Initialize the D-Bus main loop
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

# Connect to the session bus
bus = dbus.SessionBus()


def on_sleep_wakeup(*args):
    # Interface to the ScreenBrightness service
    screen_brightness_service = "org.kde.ScreenBrightness"
    
    try:
        for i in range(0,10):
            display_iface = dbus.Interface(bus.get_object(screen_brightness_service, f"/org/kde/ScreenBrightness/display{i}"), f'{screen_brightness_service}.Display')
            
            # Set the brightness to the maximum value
            display_iface.SetBrightness(10000, 0)
    except:
        pass

def main():
    # Listen for the sleep/wake signal from the 'org.freedesktop.login1' service
    bus.add_signal_receiver(on_sleep_wakeup,
                            dbus_interface='org.kde.Solid.PowerManagement.Actions.SuspendSession',
                            signal_name='resumingFromSuspend',
                            path='/org/kde/Solid/PowerManagement/Actions/SuspendSession')

    # Start the GLib main loop
    loop = GLib.MainLoop()
    print("Waiting for the sleep/wake signal...")
    loop.run()

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass