[GTP]

I have a Dell usb C dock that I got from a company that was going to trow it away. My issue is with charging. It used to work with the Dell laptops they were using, but it has a weird behavior with my HP laptop. If I connect the laptop to the dock when the laptop is off, charging works. If I instead plug in the laptop while it's running, most of the times it doesn't start charging it. I have either to disconnect and reconnect a few times, or I have to pull the dock's plug and reinsert it again. Any idea why? Did anyone else observe a similar behavior?

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Dell chargers only work (reliably, and at capacity) with Dell devices. Also Dell devices will (sometimes) refuse to work with 3rd party chargers.

Get a charger that displays the voltage & current being output on a port and you will quickly see what devices adhere to standards.

The USC-C port doesn't guarantee compatibility. Manufacturers are being evil and pushing proprietary protocols over open standards.