Same problem here.
I use forcedeth too, and it doesn't work.
But like Vincent van de Camp said, I think the problem comes from ehci instead
of forcedeth, and since they share the same irq, forcedeth is affected too.
You can see my report on bugzilla here :
http://bugzilla.kernel.org/show_bug.cgi?id=2799
If I can give more information, let me know (cc me, I'm not subscribed to this
mailing list)