And the bios warning for a lower power adapter can be disabled. But I assume it would charge slower/not at all if under heavy load. The laptop never discharged while connected (maybe if you spend hours compiling a big project on 8 cores while playing games with the nvidia card?). I had the 130 watt wd15 and it still worked perfectly with the laptop. The wd15 had a 130/180 watt power supply option, after subtracting for the dock's power usage they were specified to provide 90/130w to the laptop.

I had a xps 15 with 130w charger, and used it with the dell usb-c/thunderbolt docks (wd15/tb16). Anything higher must be manufacturer specific, so I guess dell hasn't provided any updates for thee older xps to understand the new charger's protocol thing. That's probably because USB c only goes up to 100w for power delivery. There was a github project which provided tools to copy and reprogram the chip, HP follows a similar protocol for its high end laptops, it is possible for a Dell laptop to use a HP PSU, if the BIOS is not implemented correctly. The content is something like `DELL 01 AC 065 195 033 contains the country where it is produced, the Dell part number and date codes which I don't have enough data to understand how that is coded. It helps the laptop to understand how much wattage it can get from the PSU to avoid over heating, and use the output voltage to determine whether it is safe to use it to charge the battery. It is more like EDID for power supplies, it is definitely not DRM. Internally it use a DS2501 to store the manufacturer, wattage, output voltage, output current, Dell SN and check sum. Dell Laptop PSUs has this for at least 15 years.

Ac adapter cannot be determined dell