[FS#160] usb-serial with screen not working on dlink dir860l

[LEDE Bugs]

The following task has a new comment added:

FS#160 - usb-serial with screen not working on dlink dir860l
User who did this - Russell Senior (russell)

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The pl2303 usb-serial chip has historically worked fine on OpenWrt platforms, going back to the ancient days (circa 2006) with a pl2303 built in to USB-GPS devices plugged into Netgear WGT634U and as recently as OpenWrt r49063 from late March 2016 on ramips AsiaRF AWM002.

Most recent revision with the failure is LEDE r1591. Earliest LEDE version tested on mt7621 was r1279-gc769c1b, which also failed. 

Suggest changing the title to "usb-serial (pl2303) failures on mt7621 dlink dir860l-b1".
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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#comment428