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authorHauke Mehrtens <hauke@hauke-m.de>2016-06-26 14:45:12 +0200
committerHauke Mehrtens <hauke@hauke-m.de>2016-06-26 18:20:37 +0200
commit84d489f64f3b382d5544e342f66d8806e94e85d3 (patch)
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kernel: update to version 4.4.14
Changelog: https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.14 Some manual changes to target/linux/generic/patches-4.4/610- netfilter_match_bypass_default_checks.patch were needed. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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# RGB Lighting

QMK has the ability to control RGB LEDs attached to your keyboard. This is commonly called *underglow*, due to the LEDs often being mounted on the bottom of the keyboard, producing a nice diffused effect when combined with a translucent case.

![Planck with RGB Underglow](https://raw.githubusercontent.com/qmk/qmk_firmware/3774a7fcdab5544fc787f4c200be05fcd417e31f/keyboards/planck/keymaps/yang/planck-with-rgb-underglow.jpg)

Some keyboards come with RGB LEDs preinstalled. Others must have them installed after the fact. See the [Hardware Modification](#hardware-modification) section for information on adding RGB lighting to your keyboard.

Currently QMK supports the following addressable LEDs (however, the white LED in RGBW variants is not supported):

 * WS2811, WS2812, WS2812B, WS2812C, etc.
 * SK6812, SK6812MINI, SK6805

These LEDs are called "addressable" because instead of using a wire per color, each LED contains a small microchip that understands a special protocol sent over a single wire. The chip passes on the remaining data to the next LED, allowing them to be chained together. In this way, you can easily control the color of the individual LEDs.

## Usage

On keyboards with onboard RGB LEDs, it is usually enabled by default. If it is not working for you, check that your `rules.mk` includes the following:

```make
RGBLIGHT_ENABLE = yes
```

At minimum you must define the data pin your LED strip is connected to, and the number of LEDs in the strip, in your `config.h`. If your keyboard has onboard RGB LEDs, and you are simply creating a keymap, you usually won't need to modify these.

|Define         |Description                                                                                              |
|---------------|---------------------------------------------------------------------------------------------------------|
|`RGB_DI_PIN`   |The pin connected to the data pin of the LEDs                                                            |
|`RGBLED_NUM`   |The number of LEDs connected                                                                             |
|`RGBLED_SPLIT` |(Optional) For split keyboards, the number of LEDs connected on each half directly wired to `RGB_DI_PIN` |

Then you should be able to use the keycodes below to change the RGB lighting to your liking.

### Color Selection

QMK uses [Hue, Saturation, and Value](https://en.wikipedia.org/wiki/HSL_and_HSV) to select colors rather than RGB. The color wheel below demonstrates how this works.