Try specifying the kernel parameter "usb-handoff" and see if that helps ... it's kind of like disabling usb-legacy but from the kernel side ...
Anne & Lynn Wheeler wrote:
dell poweredge 2400 only has bios option to turn motherboard usb on/off. turning that option off/on in the bios appears to have no effect on the hanging symptoms. it previously was on ... i've rebooted smp 1366 kernel 4-5 times with usb off and processes attempting to use network activity eventually hang. the 2400 has two 10/100 enet interfaces, one on the motherboard and a second card.