Thank you very much for another detailed reply. On Sat, Nov 30, 2013 at 4:55 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > By "device", I mean the piece of hardware that is supposed to reply to > the host. In your case that would be the modem (the hub does not make > up replies to packets that were sent to the modem). > > On the other hand, it is true that in some circumstances, problems in > the hub could mess up communications between the host and the modem. > This could happen if the hub communicates at high speed (480 Mb/s) and > the modem communicates at full speed (12 Mb/s). Thanks for this pointer. It turns out there was one detail I had completely overlooked. Even though I used different modems, they are all based on the same chipset (Qualcomm's MDM9200). Since I did not see this issue on with another SoC, I doubt it is a chipset-issue, but it is worth investigating. Both modems and hub are high-speed (and they are enumerated as high-speed), so that part should be fine. Thanks again, Kristian -- 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
