I have a Raspberry Pi 400 and am unable to get my Pi to wake when I short GPIO pins 5 and 6. I tried installing the latest version of the bootloader using raspi-config and checked my eeprom file to see that WAKE_ON_GPIO is set to 2 as the docs say that "Pi 400 has a dedicated power button which operates even if the processor is switched off. This behaviour is enabled by default, however, WAKE_ON_GPIO=2 may be set to use an external GPIO power button instead of the dedicated power button."
I have tried powering up by shorting GPIO pins 5 and 6 after shutting down the pi with "sudo shutdown -H now" with no luck.
I have also tried powering up by shorting GPIO pins 5 and 6 after shutting down by editing /boot/config.txt, putting in "dtoverlay=gpio-shutdown,gpio_pin=3" and then shorting GPIO pins 5 and 6.
Has anybody successfully got their Raspberry Pi 400 to start up using the WAKE_ON_GPIO functionality (shorting GPIO pins 5 and 6)?