Pi 400 power button

4 posts, 3 voices

Dec 22, 2020 11:31pm Lothar (3292) 134 posts	Does anyone know how the Pi 400 power button works under Linux? So I could make it work under RISC OS “Fn+F10 hold from 10 seconds forces power off” My guess is, Linux runs some script for it, so there must be either a GPIO pin connected to power management IC, or some – yet undocumented – power or reset register. This guy also could not find out, so he soldered a button for power into the Kensington lock – which in my view is not the best approach: https://www.raspberrypi.org/forums/viewtopic.php?t=290891

Dec 22, 2020 11:45pm Chris Gransden (337) 1207 posts	It works under RISC OS too. Using the latest stable firmware. Can also power on once powered down.

Dec 23, 2020 12:37am Lothar (3292) 134 posts	You are right. It works. Problem was, when RISC OS powers up, Num Lock is on, and with this, power button does not work. Is it possible to configure Num Lock as off?

Dec 23, 2020 8:03am Andrew Conroy (370) 740 posts	Is it possible to configure Num Lock as off? Yes, in the Keyboard section of Configure there is a radio button to configure NumLock on/off.

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