Category Archives: Linux kernel

Linux kernel

Control the LED on a USB WiFi Adapter on Linux

First, find the corresponding directory of this LED device in /sys/class/leds, such as /sys/class/leds/device_name, and switch your working directory to this directory. The device_name may be similar to the device driver of your wifi adapter. You should have a file named trigger and a file named brightness in this directory. cat trigger shows you available triggers to trigger the LED light, with the current trigger surrounded by brackets. Different triggers will turn on and off the LED in different cases. Use echo new-trigger > trigger to change trigger. cat brightness shows the current brightness of the LED. Use echo N > brightness to change brightness, where N is anĀ integer.

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