default or selected kernelversion does not have config value CONFIG_LEDS_DELL_NETBOOKS.
Result is shown for kernelversion 6.5.1

External LED on Dell Business Netbooks

modulename: dell-led.ko


Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>External LED on Dell Business Netbooks
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
This adds support for the Latitude 2100 and similar
notebooks that have an external LED.

source code: