On Thu, 16 Dec 2010, Sergej Pupykin wrote: > At Thu, 16 Dec 2010 10:56:27 -0500 (EST), > Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > If the hub runs at high speed then it changes everything, because then > > the timings are determined by the hub. But if the hub runs at full > > speed then the timings are determined by the host controller, in which > > case the hub shouldn't make any difference. > > Yes, it was USB2.0 hub > > > > I analized logs and found that problems start on speed 64bytes packet > > > per ~0.000055sec. > > > > Hmm. There are many places in the ohci-windows-sis log where the > > interval is <= 53 us but the device keeps on working. > > Thanks, so I have last question I think: can it be wire issue? > i.e. some kind of bad contact or bad soldering. Or is problem surely > in chip/firmware? I don't know; it's very difficult to tell for sure. However, the fact that the workaround for uhci-hcd helps seems to indicate that it isn't a wire issue. Alan Stern -- 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
