Hello! My girlfriend's HP laptop running kubuntu 24.04 has this problem: when it's turned off (either from the GUI or poweroff) it discharges overnight, from 100% to 0% in a few days.
I searched the web to look for fixes:
wake on lan is disabled in the BIOS
USB ports have no settings in the bios, but there's nothing connected to them anyway
the system is actually powered off, not sleeping (at least if poweroff actually works)
everything, firmware included, is up to date
She doesn't remember having this problem from the beginning, but cannot tell when this started occurring
Did any of you ever encounter this problem? I don't know what else to do, and it's quite annoying.
My wife's HP laptop does this as well (she is running Windows). A previous laptop did this and a BIOS update fixed it. For most laptops the official response from manufacturers seems to be: eat shit.
My son's Windows laptop did the same. Turns out there is a setting to make Windows truly shut down when selecting "shut down" from the menu, because normally it secretly sleeps or hibernates or something to have faster start-up times. There's also the power another device via USB option that you may have to disable in BIOS / EFI settings.