RGB Case Fans turn off when pi has booted turn ON when the Pi is shutdown

General
1

I have some strange behaviour with the RGB case fans. When the pi is starting up, the RGB case fans will spin up. Once raspiOS has started, the fans stop. If I shut the pi down, the case fans spin UP again and stay on. The only way then to stop them is to pull the power. I can control the fans using the “sudo pironman5 -gm 0/1/2/3 or 4” command. I’ve got it set to mode 3 - balanced.

I’ve confirmed and made sure the “POWER_OFF_ON_HALT=1” is set. When I shut it down, the OLED screen does go off, but the case fans that were off when the OS is running, suddenly spin up and stay on.

I checked the cables to the fans, swapped the + / - wires to see if that did anything, it didn’t. I saw another post about downgrading the kernel, which I did. Down to v6.6.44-v8-16k+, but the issue remained. Now back running kernel 6.6.63-v8-16k+.

Just not sure why if the OLED screen does turn off, suggesting the power rail is disabled, why do the case fans suddenly turn on when the pi shutdown, even if they weren’t running before. It’s like there’s a default state of ON until the OS boots and the conf setting takes over, but I can’t figure where or how that’s controlled.

Thanks

2

What system are you currently using, and what is the system version?

If the fan continues to operate after the PI5 is shut down, please edit the configuration file with the following command:

sudo rpi-eeprom-config -e
POWER_OFF_ON_HALT=1

Save and exit, then reboot the PI5 for the changes to take effect.

After safely shutting down the Pironman 5, the GPIO of the PI5 will turn off, and the fan will stop working. The fan will only operate normally when you start the Pironman 5 again.

If you encounter any issues, please provide a video of the problem so we can assist you in analyzing and resolving it.