USB3 prevent correct shut down of the system

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http://ubuntuforums.org – Hello, My system, since I've upgraded to the kernel 3.12, when is shut down from Ubuntu 13.10 it turns on after few seconds. The problem does not exist if I turn off the USB3 support from the (UEFI) bios. I tried to add all the various option in the GRUB command line to enable/disable ACPI, disable IRQ and so on with no luck (I don't think that ACPI is the problem here). Probably it's worth to know that if I run Code: lsmod |grep hc I get as result: Code: ahci                  30063  4 libahci        &n (Hardware)