A simple GUi brightness control for linux systems running xfce

xfcebrightnessctrl.py

#!/usr/bin/env python3

import subprocess
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk

class BrightnessApp(Gtk.Window):
    def __init__(self):
        super().__init__(title="Brightness")

        self.scale = Gtk.Scale.new_with_range(
            Gtk.Orientation.HORIZONTAL, 0, 100, 1
        )
        self.scale.set_value(self.get_current())
        self.scale.connect("value-changed", self.on_change)

        self.add(self.scale)

    def get_current(self):
        out = subprocess.check_output(["brightnessctl", "g"])
        cur = int(out.strip())
        out2 = subprocess.check_output(["brightnessctl", "m"])
        maxv = int(out2.strip())
        return (cur / maxv) * 100

    def on_change(self, widget):
        val = int(widget.get_value())
        subprocess.call(["brightnessctl", "set", f"{val}%"])

app = BrightnessApp()
app.connect("destroy", Gtk.main_quit)
app.show_all()
Gtk.main()