[FS#587] no wwan with qmi based modem quectel ec20

[LEDE Bugs]

The following task has a new comment added:

FS#587 - no wwan with qmi based modem quectel ec20
User who did this - JochenFriedrich (JochenFriedrich)

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To me this looks more like a kernel bug. Both uqmi versions work ok with 4.4 and fail with 4.9.

This seems to be the bug:

https://lists.freedesktop.org/archives/libqmi-devel/2017-February/002067.html

Jochen 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=587#comment2224