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I have recently determined that USB Optimization in the BIOS prevents the USB 3.0 ports from working. Specifically, in Device Manager, the Renesas Electronics USB 3.0 Host Controller has a Device Status of "This device cannot start. (Code 10)"
The BIOS claims that for USB Optimization, "This feature does not affect USB capabilities after OS boot." Sorry, but it prevents USB 3.0 from starting. Disabling and re-enabling in Device Manager does nothing. Disabling USB Optimization in BIOS allows USB 3.0 to work properly.
Using Intel DZ68DB board, Win7 X64, latest BIOS and drivers for everything. Strangely I first noticed this problem after updating the firmware yesterday on my Crucial M4 SSD; before that I'm almost positive I had USB Optimization Enabled in BIOS and USB 3.0 definitely worked.
This issue is similar to http://communities.intel.com/message/125298 except my board is different. Any suggestions?