On Precision 5510, 20, and 30s that are connected to WD15 and WD19 docks have a major problem. When you undock all USB goes down, even if you re-dock. You have to restart the laptop for the USB to work again.
I'm 99% sure the issue is from the Realtek drivers that are associated with the dock. For the WD15's they released an update that fixed this issue. Now the problem is back with the WD19 models. I'm gonna try to uninstall these drivers to see what happens. I see a lot of people have had the same issue but there's no actual fix.