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I also have this problem on Asus p5gc-mx, Snow 10.6.1. I haven't made any changes to any kexts yet. When i plug in an ipod it says I am using a USB 1.1 port (but my ports are all USB 2.0). The transfer speeds in System Profiler say maximum 12Mbps but USB 2.0 should be 480Mbps. Also one pair of USB ports it not working at all. In BIOS I have Legacy USB enabled and Hispeed selected for USB2.0.