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Enable the Nexus 6s secret RGB LED

As with previous Nexus devices, the Nexus 6 includes a RGB notification LED,but strangely it’s not an option that is enabled by default-here’how to fix that..

Prepare your device
Enabling the RGB LED on the Nexus 6 is straightforward, but you do need to ensure that your device is rooted. This is because Lollipop provides no normal access to the LED  it needs to be controlled using root shell commands sent from an application with notification access, for instance an app like LightFlow.

Install LightFlow
LightFlow LED&Notifications is a £1.49 download from the Play Store which offers the ability to customise LED notifications on any Android device, enabling you to set the colour and sequence for any app/system event (hardware allowing). It also supports repeating notifications and sleep/charge modes

Enable root mode and the mixer
When you first load LightFlow, it will prompt you to enable notification access. In addition, to support the Nexus 6, you need to enable the Root mode, ‘Run every command as root’ and Direct mode options. You will also need to ensure you grant superuser access for all requests that pop up

Disable ambient screen mode to save power
The reason the LED is disabled on the Nexus 6 is because it includes Ambient Mode, which displays
notifications on the screen when the device is in standby. There is an option in system settings to disable this when using the LED instead, which will improve battery life.