On the Raspberry Pi 5, there is a hardware power button. When the power is cut and then restored, the system does not automatically restart.
Is it possible to disable this behavior directly from Home Assistant?
I just ran a quick test on my RPi 5. I performed an orderly shutdown of HAOS on the PI. The LED turned RED. I then unplugged the Official Raspberry Pi 5 power supply from the mains, counted to 10, and then plugged the power supply back into the mains. The RPi 5 booted up without any manual intervention.
I then ran a second test. Instead of performing an orderly shutdown of HAOS, I simply unplugged the power supply, counted to 10, and then plugged it back in. Once again, the RPi 5 booted up without touching the manual power button.
Please note that cutting the power to a RPi without doing an orderly shutdown of Home Assistant may corrupt the file system which has been known to cause issues with HA.
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Thanks. Yes, I am aware of the risk. I ran my test on a test/development HAOS RPi 5 system. I just wanted to make sure I covered a typical power outage without UPS scenario. 
Having this issue. I have had some power failures and each time I have to manually press the power on button on my Pi-5 running HA.
How can I set it to boot when power is restored? I am considering using something other than a Raspberry Pi now that this keeps happening. Any suggestions?
I am having a similar but not reproducable issue - 9 out of ten times the raspberry starts without problem, but the 10th time I have to press the bower button.
Sometimes I also have to press the power button after a regular shutdown, removal and reattachment of power.
Therefore Iād also like to disable the button completely as the raspberry sits on a remote location for monitoring.