dbus-after-suspend.py

#!/usr/bin/env python3

from gi.repository import GLib
from gi.repository import Gio

import os
import time

def onPrepareForSleep(conn, sender, obj, interface, signal, parameters, data):
    if not parameters[0]:
        print('Triggered')
        time.sleep(5)
        os.system('pactl set-default-sink alsa_output.pci-0000_07_00.4.analog-stereo')

system_bus = Gio.bus_get_sync(Gio.BusType.SYSTEM, None)
system_bus.signal_subscribe('org.freedesktop.login1',
                            'org.freedesktop.login1.Manager',
                            'PrepareForSleep',
                            '/org/freedesktop/login1',
                            None,
                            Gio.DBusSignalFlags.NONE,
                            onPrepareForSleep,
                            None)

print('Starting main loop')
GLib.MainLoop().run()