[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)

----------
Just reconfirmed this issue still exists on r6655-3612d90351.  It does matter what is plugged in at the end of the ethernet cable.  If it is a 10/100 switch, no problems.  If it is a gigabit ethernet, I get the problem:

# dmesg | grep eth0
[    1.401954] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[    4.674281] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    7.789596] eth0: link up (10Mbps/Half duplex)
[    7.794104] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    8.227655] eth0: link down
[   19.668418] br-pub: port 1(eth0) entered blocking state
[   19.673682] br-pub: port 1(eth0) entered disabled state
[   19.679497] device eth0 entered promiscuous mode
[   19.765653] eth0: link up (1000Mbps/Full duplex)
[   19.799292] br-pub: port 1(eth0) entered blocking state
[   19.804555] br-pub: port 1(eth0) entered forwarding state
[   36.120995] NETDEV WATCHDOG: eth0 (ag71xx): transmit queue 0 timed out
[   36.266008] eth0: tx timeout
[   46.108024] eth0: tx timeout

----------

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=296#comment4570