Suddenly, my laptop (Dell Precision 5570) does not detect the original 130W USB C charger as a such. Instead, it issues a warning while booting stating that I have plugged in a low power adapter.

Inspecting the BIOS, I notice that it detects the charger as a 5W charger.

I plugged in another USB C charger (not dell) that is supposed to be 65W and it detects it as 15W. 

I found the following post, but it seems the solution is just a BIOS update, but I thing I am running the latest version of the BIOS (1.20).

https://www.dell.com/community/en/conversations/xps/dell-xps-9575-slow-charging-error-with-default-charging-adap/647f7f3ef4ccf8a8dedb66fa?keyword=slow%20charging