Usb 2.0 devices are not working in 3.0 port

[behzad396]

i have dell inspiron n5110 the problem is usb 3.0 devices are working fine in 3.0 port but 2.0 devices are not working

 

[Colif]

To determine if this is a hardware or software problem, try booting into a Linux live CD and see if USB 2.0 devices work in the USB 3.0 ports. If they do work, the problem is in the drivers. If not, the problem is in the hardware.

http://superuser.com/questions/482179/usb-3-0-ports-backwards-compatibility-problems-with-2-0-devices