[FS#160] usb-serial (pl2303) failures on mt7621 dlink dir860l-b1

[LEDE Bugs]

The following task has a new comment added:

FS#160 - usb-serial (pl2303) failures on mt7621 dlink dir860l-b1
User who did this - Russell Senior (russell)

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The physical device is out of my regular kit bag that I use regularly and works fine on my desktop, and has worked fine in the same AsiaRF AWM002 as referenced above, so the adapter itself is okay.  I have also tried 4 different pl2303-based devices, all of which work in my Ubuntu 14.04 laptop.  I think we can rule out a bad pl2303.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=160#comment430