Hello, by default, all USB ports are enabled on your T5820.  When you connect an UASP supported device, you will see the driver is automatically installed in device manager.  So far, I have no problem with Windows base but I think the support in Linux is limited. On another note, edit your post to remove the service tag, it's considered private info.  
I'm working with my Dell Precision 5820 tower and I want to connect an external storage controller that supports UASP protocol.  Are the USB 3.1 ports on my system UASP enabled?  The service tag is .  A search through the 5820 manual didn't turn up either UASP or USB Attached SCSI Protocol. 
USB Attached SCSI Protocol support for Dell Precision USB 3.1 port