Hi, My USB 3G modem (Huawei E156) is connected to beagle bone black.
I noticed long ping times (from 4 to 30 seconds!) and low speed (9kbps). No package lost %. Discovered that the problem is that the /dev/ttyUSB0 device is set up for 9600bps. Tried with the 4 combinations that I had available: ubuntu with kernel 3.8.13; debian with kernel 3.13.9; BBB revision A6 and BBB revision B; I have 5 identical modems, already tried 2 of them, same problem. # stty -F /dev/ttyUSB0 speed 9600 # stty -F /dev/ttyUSB0 115200 stty: /dev/ttyUSB0: unable to perform all requested operations # stty -F /dev/ttyUSB0 speed 9600 By looking at /sys/kernel/debug/usb/usbmon/0u I can see that usb speed is truncated at 9600bps. Using the same modem in my notebook (intel i7 x64 PC / Ubuntu kernel 3.11), all works as expected; I have high speeds on /dev/ttyUSB0 and it works as expected. Any hints about how to solve this? Thanks in advance, -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
