[FS#296] Ubiquiti Bullet M 10/100 ethernet interface comes up as gigabit, doesn't work

[LEDE Bugs]

The following task has a new comment added:

FS#296 - Ubiquiti Bullet M 10/100 ethernet interface comes up as gigabit, doesn't work
User who did this - Russell Senior (russell)

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I just saw this again on 5572-g4a4d957d1a.  It seems to matter what it is plugged into or maybe it just isn't deterministic, since the same configuration on the same kind of hardware nearby (flashed at about the same time with the same build, except for ipaddr) came up okay.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=296#comment4005