Update = After completing troubleshooting, a DELL-Cares agent setup a part replacement.
When I first bought this laptop everything is working fine until don't know which update (windows update or bios update) ruined everthing. The left side of the laptop which has 2 USB-C port and the right side has only 1 USB-C port and the problem is with left side on the second port (not after the kensington lock). My setup is like this, when I first bought this laptop, the first port (right next to the kensington lock) will be my power source from the power brick and the second port will be my Anker USB-C to USB 3.0 4-port dongle. After not sure which stupid update the second port which is my dongle port is not turning on when I power up my laptop. I have to unplug and plug in a few times to get it to turn on. I've tried switching positions with my power cord and it works just fine. But my personal prefrence a.k.a cable management will be the power cable on the 1st and my dongle on the 2nd. I now have to do this little exercise every time I power up my laptop which is to unplug and plug in a few times to get my dongle to work. Don't tell me to switch positions with my power cable as it works fine like it used to be because I just don't like the cable crossing each other. My power cable runs behind my laptop and my dongle runs to the front of my laptop. If I switch positions it'll look like those cables crossing each other which looks ugly and putting slight pressure on the port. Any solution to this?
Dell XPS 15 9510 USB-C port not working