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,