The Brightness service reads and controls screen backlight via the locally-built Brightness GIR library, which performs direct sysfs I/O on /sys/class/backlight/<device>/brightness. No external process is spawned.

properties

• screen: number: current brightness as a fraction in [0, 1], readable and writable
• device_name: string: the /sys/class/backlight device in use (read-only)

constructor

const brightness = await Service.import("brightness");

// Uses the first available backlight device by default.
// Pass a device name to select a specific one:
const brightness = new Brightness("intel_backlight");
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Example Widget

const brightness = await Service.import("brightness");

const BrightnessSlider = () =>
  Widget.Slider({
    min: 0,
    max: 1,
    value: brightness.bind("screen"),
    onChange: ({ value }) => {
      brightness.screen = value;
    },
  });
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