Ubuntu Networking :: Atheros Gigabit Controller Stuck At 100 Mbps?

I'm using Ubuntu Server 10.10 64 bit and am trying to get my Atheros AR81xx gigabit ethernet controller to use 1 gbps.I have 2 ethernet controllers, one's a linksys 100 mbps (which is connected to the router which goes to the internet) and the other is the Atheros gigabit controller that is connected to a Windows desktop that has an NVIDIA gigabit ethernet controller (for faster file transfers with a gigabit connection) I've ruled out that the problem is with the desktop as I plugged the windows PC into my macbook (which has a gigabit controller), and both the macbook and desktop report a gigabit connection.

I plug the windows desktop into the server and I only get 100 mbps. I am using a Cat 6 patch cable. I've tried several methods with ethtool to force it into 1 gbps mode, but none work. I've tried using a different cable. no change. I've tried making windows force a 1 gbps connection, didn't have the option to in the driver configuration. Only 10/100 configs. the commands I've tried in ethtool

Code:

ethtool -s eth0 speed 1000

Reports no error, but no effect. I've tried forcing off auto negotiation (I had a hunch it was causing the problem)

Code:

ethtool -s eth0 speed 1000 duplex full autoneg off

I get this

Code:

Cannot set new settings: Invalid argument
not setting speed
not setting duplex
not setting autoneg

I tried each setting individually, and autoneg won't set, the others will (but not do anything)