Letux Kernel


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How to control the LEDs


are controlled through the TCA6507 driver.

LED numbers

The examples below all refer to LED 0. Substitute the correct LED number:

  • 0: AUX - Red
  • 1: AUX - Green
  • 3: Power - Red
  • 4: Power - Green
  • 6: WLAN/Bluetooth Reset (active low - don't use blink or dimmed modes!)

LED on

echo "255" >/sys/class/leds/tca6507:0/brightness

LED permanently off

echo "0" >/sys/class/leds/tca6507:0/brightness

LED half brightness

echo "127" >/sys/class/leds/tca6507:0/brightness

LED dimming and blinking

  • use $value between 1 and 15 for dimmed intensity
  • use $value between 17 and 31 for blinking

Note: all LEDs share the same intensity value unless they are set to 0 or 255!


make AUX button blink yellow (red+green)

echo 31 >/sys/class/leds/tca6507:0/brightness
echo 31 >/sys/class/leds/tca6507:1/brightness

make AUX button blink between red and yellow (red+green)

echo 255 >/sys/class/leds/tca6507:0/brightness
echo 31 >/sys/class/leds/tca6507:1/brightness