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Red PWR LED is always on / not detected by the system

Hello debian-arm List,
I'm running debian on a raspberrypi 3 (image from https://raspi.debian.net) . I'd like to turn off the red LED but it doesn't work


Red LED is always on

It seems like it is not detected as PWR LED instead, it is presented as mmc1::

ACT LED is detected correctly.


# ll /sys/class/leds/
total 0
lrwxrwxrwx 1 root root 0  7. Jul 22:44 ACT -> ../../devices/platform/leds/leds/ACT
lrwxrwxrwx 1 root root 0  7. Jul 22:44 mmc1:: -> ../../devices/platform/soc/3f300000.mmc/leds/mmc1::

The mmc1 directory also contains the files "brightness" and "trigger" with the "typical" contents of LEDs, but changing them has no impact.


uname -a
Linux user 5.10.0-15-arm64 #1 SMP Debian 5.10.120-1 (2022-06-09) aarch64 GNU/Linux


  • All LEDs are off by default incl. red LED
  • Red LED appears under /sys/class/leds/pwr
  • Red LED can be turned on and off by changing files "triggers" and "brightness"

Steps to reproduce:

  • Deploy 20220121_raspi_4_bullseye.img (64 Bit arm tested image bullseye)
  • boot (Raspi 3)

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