Perhaps, i tried reading up about it, looks like HP will not just accept 19V and needs some sort of verification of the power supply's capabilities. It will just run in "Low power mode" if only 19V is supplied and no data signal

That actually sounds like a fun challenge! Good luck to you!

Yeah they aren't the most powerful chips, but it will work for what i need and i don't pay for power here, so honestly it's fine for me