After some fiddling it seems that if i "disable USB2.0" (a bios option - as a result the ehci_hcd driver is not loaded) the freezing problem disappears. This is a 5yr old laptop with 3 usb ports. Usually from lspci -v i see three instances of USB1.1 controllers using ohci_hcd, and a mysterious 4th usb controller USB2.0 using ehci_hcd. Is this normal, or is it a fudge they were doing when usb2.0 was pretty new? Anyway, i hope this extra bit of information helps somebody work out the cause of the problem - obviously disabling USB2.0 is not an ideal 'fix'
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