On 29 October 2011 12:40, Neeraj Jakhar <neeraj.jakhar@xxxxxxxxx> wrote: > On 26 October 2011 21:43, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> >> Try one more experiment: Collect two equivalent usbmon traces, one from >> each of the computers. And this time, unload ehci-hcd before starting >> the trace. That just might have some effect. Perhaps comparing the >> two traces will show something. Although I doubt it -- this really >> does look like a low-level problem, like the sort of thing that happens >> when a device doesn't have quite enough power. > > Alan, sorry for a delayed response. I was caught up in a few things. > > I tried unloading the ehci_hcd on the laptop on which this modem is > working. However, there is nothing coming up in either dmesg or usbmon > output on plugging in the modem. In fact, even the lsusb command fails > with the following output: > > $ lsusb > unable to initialize libusb: -99 > > Just to clarify, ohci_hcd was loaded all this while. Sorry for multiple mails (I hope I am not making too many enemies on this mailing list :), but, Surely enough on the laptop on which modem was not working, after unloading ohci_hcd nothing appears in dmesg and usbmon output on plugging in the modem. And ehci_hcd was loaded all this while. -OBD -- 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
