As Richard says, some laptops use electronic 'serial numbers' to verify genuine or not so your lapotop may decide it's not a genuine AC adapter and refuse to charge.
Never seen one. Some use a third pin or OneWire to communicate, but none of them actually cryptographically authenticate (unlike iPhones).
I've been using many high end computers, mostly ThinkPads and Macbooks, none of them require the "original" adapter that doesn't have a Chinese clone.
Buy a good power supply, and buy a Chinese cable, marry them together, and you are good.
I didn't claim they did 'authenticate'.
Dell machines used to include a Dallas one wire device, I think it was in the D600 series laptop PSUs that I first saw one (when Win XP was new), memory tells me it was an electronic serial number or ID tag but I really can't remember the part number any more, however, if the part was damaged or disconnected somehow the laptop would power up but refuse to charge.
I *think* I may have a faulty Dell one here which I could disassemble and take pictures of
HP adapters use something similar.
Lenovo use a simple resistor to identify adapter capability.
Apple are a protectionist world of their own.
Again, I'm a fan of the low prices the Chinese manufacturers are able to bring to the market, I'm not in any way knocking clone PSUs, most are perfectly adequate and work as well as the original, just passing on a warning from my experience that some of them are really poor and can cause 'odd' problems.