On Thu, 26 Aug 2010, Artem Makhutov wrote: > Hello, > > Alan Stern schrieb: > >> A few minutes later I can not send any AT commands to the modem any > >> more, neigther I can receive the preriodical updates from the modem. > > > > Maybe the problem is in the hubs. What happens if you attach one or > > two modems directly to the computer without using any hubs? > > Yes, this is also what I suspected at first. > > No, the problem is not in the hub. > > The proble also exists when directly connecting the modems to the > mainboard or to a USB-PCI controller. > > I am just installing FreeBSD. Lets see if I can reproduce the same > problems... Another thing you can try with Linux is to capture a usbmon trace showing the problem. It will be best if you do this with as few USB devices as possible, so no hubs and only one or two modems. See the instructions in Documentation/usb/usbmon.txt. 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
