It is a regression that appears in the version 3.0rc2 of the Linux kernel: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1067222

That same source presents two workarounds that do not seem to do the trick on all systems.

The first one:
$ sudo setpci -s 00:1c.2 0x50.B=0x40

The second one:
$ sudo modprobe -r tg3
$ sudo modprobe tg3

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