On Mon, 24 Oct 2011, OBD wrote: > On 23 October 2011 21:41, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > The type of system doesn't matter; what matters is the USB hardware. > > The usbmon trace shows that the modem gets disconnected whenever the > > OHCI controller on the AMD system issues a reset. �This could be the > > fault of the modem or of the controller. > > > > Do any other full-speed devices work on this system? > > Actually, a few USB disk drives have been connected to this system in > the past (to the same USB port as well). Even now one USB Disk Drive > is connected. I am not sure if it is full speed or not. How does one > check that? > > Further I tried connecting another USB modem to the same system. The > dmesg log when I connected the modem is as follows: > > > > [82869.475111] hub 2-0:1.0: unable to enumerate USB device on port 1 > [82869.791769] hub 4-0:1.0: unable to enumerate USB device on port 1 > [82870.138438] hub 2-0:1.0: unable to enumerate USB device on port 1 > [82870.408438] hub 2-0:1.0: unable to enumerate USB device on port 1 > [82870.668437] hub 2-0:1.0: unable to enumerate USB device on port 1 > [82870.988871] hub 4-0:1.0: unable to enumerate USB device on port 1 > [82871.215110] hub 2-0:1.0: unable to enumerate USB device on port 1 > [82872.081784] hub 2-0:1.0: unable to enumerate USB device on port 1 I'd say the problem is in the controller. What output do you get from "lspci" and "lspci -n"? 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
