USB driver and GSM related issues

[Marius Heil]

Hello,

I have successfully compiled and installed usb_modeswitch, Networkmanager and ModemMager on snappy Ubuntu for Raspberry in order to get a 3G stick to work.
3G connections work well and I am almost happy with the setup, but there is one problem:
When I disconnect the 3G stick from the Raspberry while it is connected to the internet, it will produce an infinite loop of:
option_instat_callback: error -71
This could of course happen with power failure, etc,... so I have to fix this problem.
I have read through various forum posts and I could not find any fix. When I tested the same on an Ubuntu machine, it seemed to work more gracefully and the USB device
was detached successfully. What kind of USB driver is snappy ubuntu using?

My snappy image is: ubuntu-15.04-snappy-armhf-raspi2.img

Regards,
Marius Heil
Software Engineer

M-Way Solutions GmbH

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