Huawei me906s-158

Bjørn Mork bjorn at
Mon Apr 4 14:38:08 UTC 2016

Andreas Fett <andreas.fett at> writes:

> We have discovered that the Modem works reliably if we switch it (via
> some shell helper from udev) 1st to USB Configuration 0 and then to 3.
> I don't know what this does, but suspect some kind of firmware reset.
> I'll try to provide new USB captures for this scenario within the next
> days if those would could aid debugging.


This makes sense even if the USB captures don't show any other
differences.  The firmware might assume that the configuration always
switches from 0 to either 1, 2 or 3 and then stays there.  That's what
would happen on a Windows system.  There are most likely a number of
internal firmware settings associated with such configuration switches.
Failure to reset them could very well mess up things beyond rescue.


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