Hello, I’m trying to install an On/Off Shim on my Raspberry Pi 3. I have installed several on various Pi Zero (W)s and not had any major issues.
Tonight I’ve spent several hours trying to figure out why it wouldn’t power off completely. I reinstalled the On/Off Shim oneliner a few times, I finally plugged in an LCD (it’s headless normally) and still had no clear cause. I finally realized it’s my powered USB hub.
The power from the hub, I guess, powers the Pi 3 from the USB ports? I didn’t know that, but the power is never completely cut to the Pi 3 when the USB hub is plugged into the PI 3 (with power plugged into the hub).
Is this a known issue? Is there a workaround for this? Once it’s powered up and then shutdown, I can’t re-power it on. I have to pull all the power from the USB hub and the Pi and then replug it in. I have an LED on a 3v3 pin and it always remains on, along with the Pi 3’s onboard red LED…
I’m using the powered USB hub for two USB webcams and comm. with a 3d printer.