Module: Backlight Slider - Alexays/Waybar GitHub Wiki

The backlight/slider module displays and controls the current brightness of the default or preferred device.

The brightness can be controlled by dragging the slider across the bar, or clicking on a specific position.

CONFIGURATION

option	typeof	default	description
min	int	0	The minimum volume value the slider should display and set.
max	int	100	The maximum volume value the slider should display and set.
orientation	string	horizontal	The orientation of the slider. Can be either horizontal or vertical.
device	string		The name of the preferred device to control. If left empty, a device will be chosen automatically.

[!NOTE] As well as the JSON configuration, the slider modules are special in the sense that they require styling to work. Read more about it here. The TL;DR is that you need to set min-width and/or min-height (depending on whether your slider is vertical or not) for it to display correctly. That's a GTK detail, not an issue with Waybar.

EXAMPLES

"modules-right": [
    "backlight/slider",
],
"backlight/slider": {
    "min": 0,
    "max": 100,
    "orientation": "horizontal",
    "device": "intel_backlight"
}

STYLE

The slider is a component with multiple CSS Nodes, of which the following are exposed:

• #backlight-slider: Controls the style of the box around the slider and bar.

• #backlight-slider slider: Controls the style of the slider handle.

• #backlight-slider trough: Controls the style of the part of the bar that has not been filled.

• #backlight-slider highlight: Controls the style of the part of the bar that has been filled.

STYLE EXAMPLE

#backlight-slider slider {
    min-height: 0px;
    min-width: 0px;
    opacity: 0;
    background-image: none;
    border: none;
    box-shadow: none;
}
#backlight-slider trough {
    min-height: 80px;
    min-width: 10px;
    border-radius: 5px;
    background-color: black;
}
#backlight-slider highlight {
    min-width: 10px;
    border-radius: 5px;
    background-color: red;
}