I have the origional top spec model of the Xiaomi Mi Notebook Pro with a i7-8550U, MX150 and 16GBs of RAM, which only ships with a 65W charger. Unfortunately, the components draw too much power, meaning that when I'm gaming while plugged into this power supply I will slowly lose power. Therefore I bought a 90W USB-C Dell charger last week, and tried that one out. It turns out this charger charged my laptop even slower, with it requiring around 6 hours to charge my laptop when it was idling instead of less than 2 with the OEM charger. Additionally, when gaming it very quickly loses power, with my full battery fully depleted after just half an hour of gaming.
My only idea to what could be causing this would be if the computer wasn't communicating for the right amount of power to be supplied to it, as USB-C is universal and I've been told that the device being charged will measure temperatures and such to determine what voltage and amperage it should ask to be supplied, and when nothing was communicating the charger would default to supplying the lowest amount of power it is capable of in order to avoid damaging the device being charged in case it wanted very little power, therefore my laptop could not be communicating properly with the charger, causing the charger to send less power than it was capable of. Do any of you have an idea of what the problem is or how I could fix it? My dad tried it with his Dell laptop and said it worked well, and I'm going to try and record the charging speeds of his laptop with this 90W charger compared to the speeds with his OEM 65W charger.