There is nothing wrong with your chipset driver (or indeed any driver).
USB ports staying "live" after PC shutdown is perfectly normal - - it's a deliberate design feature so you can power or charge devices like a mobile phone without having turn on your PC.
It can usually be disabled in the BIOS settings - - - or a simpler method is just turn off the PSU with the rocker switch at the back after shutdown if it really bothers you.