Pi Desktop power on

Question

Is it possible to let the raspi boot immediately after usb power is connected? 
 normally he waits for the button to be pressed.

baldengineer · Accepted Answer

So, the documentation page you linked to has a link to the product's GitHub repo . 
 There, someone opened an issue for powering on after power loss (for example, after someone turns the power strip off and then back on.) 
 It looks like a very small modification with a 10 uF electrolytic capacitor works for others. 
 (Also, the code for the STM8 in the power control unit is there too. But not much about how to build and program the microcontroller, so that might be a tougher route.)