How did you disable the LED? I mean I can disable LEDs via /proc but not in conf...

pja · on Sept 28, 2023

Add

    # Disable Power LED after boot
    dtparam=pwr_led_activelow=off
    # Disable SD card activity led
    dtparam=act_led_trigger=none
    dtparam=act_led_activelow=off
    # Disable the ethernet LEDs - these are Pi4 specific values.
    # Look in the docs for the values for other Pi boards.
    dtparam=eth_led0=4
    dtparam=eth_led1=4

to /boot/config.txt

Fnoord · on Sept 28, 2023

Thank you!

It appears to depend on firmware or kernel but for recent kernels (recent 6.1 or 6.2) activelow is no longer necessary [1]. It seems to work on CM4.

PS: my bad I disabled the LEDs via /sys not /proc previously:

> # for i in /sys/class/leds/*; do echo 0 > "$i/brightness"; done

[1] https://github.com/raspberrypi/firmware/issues/1742

doubled112 · on Sept 28, 2023

I've had this drive me crazy.

The required lines were different between the Pi 2 and Pi 4 I was using at the time, and the documentation was not updated (or I'd found old docs).

An exercise in trial and error.