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---
title: RGB Underglow Configuration
sidebar_label: RGB Underglow
---
See the [RGB Underglow feature page](/docs/features/underglow) for more details, including instructions for adding underglow support to a board.
See [Configuration Overview](/docs/config) for instructions on how to change these settings.
## Kconfig
RGB underglow depends on [Zephyr's LED strip driver](https://github.com/zephyrproject-rtos/zephyr/tree/main/drivers/led_strip), which provides additional Kconfig options.
Definition file: [zmk/app/Kconfig](https://github.com/zmkfirmware/zmk/blob/main/app/Kconfig)
| Config | Type | Description | Default |
| ------------------------------------ | ---- | ----------------------------------------------------- | ------- |
| `CONFIG_ZMK_RGB_UNDERGLOW` | bool | Enable RGB underglow | n |
| `CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER` | bool | Underglow toggling also controls external power | y |
| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_STEP` | int | Hue step in degrees (0-359) used by RGB actions | 10 |
| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_STEP` | int | Saturation step in percent used by RGB actions | 10 |
| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_STEP` | int | Brightness step in percent used by RGB actions | 10 |
| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_START` | int | Default hue in degrees (0-359) | 0 |
| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_START` | int | Default saturation percent (0-100) | 100 |
| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_START` | int | Default brightness in percent (0-100) | 100 |
| `CONFIG_ZMK_RGB_UNDERGLOW_SPD_START` | int | Default effect speed (1-5) | 3 |
| `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START` | int | Default effect index from the effect list (see below) | 0 |
| `CONFIG_ZMK_RGB_UNDERGLOW_ON_START` | bool | Default on state | y |
Values for `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START`:
| Value | Effect |
| ----- | ----------- |
| 0 | Solid color |
| 1 | Breathe |
| 2 | Spectrum |
| 3 | Swirl |
## Devicetree
ZMK does not have any Devicetree properties of its own. See the Devicetree bindings for [Zephyr's LED strip drivers](https://github.com/zephyrproject-rtos/zephyr/tree/main/dts/bindings/led_strip).
See the [RGB underglow feature page](/docs/features/underglow) for examples of the properties that must be set to enable underglow.