On Tue, Jan 20, 2009 at 11:16:05PM +0800, YIngjian Zhan wrote: > sorry for lacking of information. my kernel is 2.4.26. quite old, > right? It's for a embedded device. Ah, yeah, with 2.4, you are on your own, sorry. Odds are you also have a very old version of the driver for this controller, I know lots of other people have had problems with it in the past. good luck, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html