How to autostart notebook on electric power is connected?

Have a arcade machine and a hp elitebook (8440p). How to start notebook automaticaly when plug the energy?, I want to avoid soldering the part of the power button to have an external button, I prefer that it starts when it is connected to the electric power. It's possible?, Some configuration of the bios or some bridge that I should create? Underneath it has workstation connectors. I use Linux and lakka tv.

On BIOS pc the option exists: "power-on when AC power is restored" but in elitebook is not found, the bios is very restricted. In youtube channels says use the jumper on the motherboard, but for desktop. I'm looking for the jumpers on elitebook motherboard.

The option in the PC BIOS is when power is restored after a power outage. There wouldn't be a power outage in a laptop unless the battery completely runs out (unlikely) or the battery is removed such that the charger is the only power source.

Removing the battery and flashing the BIOS with a custom firmware that has this feature would be required.

Note flashing the BIOS is risky and could result in bricking the motherboard. This could make the laptop unusable and require a replacement motherboard.

I've not tried this, but I postilate a solution in the form of "a bridge you can make"

It appears your HP supports wake-on-lan. Enable this and get a trivial pc - an arduino or similar would be ideal - and power it from the same power source. Configure it to send Wake On LAN requests to your laptop whenever it is powered on.