Intel 82541GI NIC comes up at 10mbps on one port

I'm stumped. I've got a motherboard with the following dual-port NIC:

03:0a.0 Ethernet controller: Intel Corporation 82541GI Gigabit Ethernet Controller
Subsystem: Intel Corporation PRO/1000 MT Network Connection

One port is connected to my DSL modem. It comes up at 100mbps:

Aug 17 15:54:41 headache kernel: e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX

The second port is connected to a plain-vanilla Linksys router. That port always negotiates to 10mbps, no matter what:

Aug 17 15:54:41 headache kernel: e1000: eth1: e1000_watchdog: NIC Link is Up 10 Mbps Full Duplex, Flow Control: RX/TX

* Other machines have no problems talking to the Linksys router at 100mbps.

Things that I've already tried:

* Swapped the cables. Swapped the DSL cable with the router cable. The router port still comes up at 10mbps, the DSL port still comes up at 100mbps. This proves that both cables can handle 100BaseT.

* Switched the ports on the motherboard. Switched the DSL port with the router port, using same cables (swapped the IP addresses on eth0 and eth1). The new router port (former DSL port) still comes up at 10mbps, the new DSL port (former router port) comes up at 100mbps. This proves that both ports can handle 100BaseT.

* Switched the ports on the Linksys router. Switched the port on the router with the port connected to another machine, that comes up at 100mbps. The other machine comes up at 100mbps on the port that this Intel NIC negotiates down to 10. This proves that all ports on the router can handle 100BaseT.

* Disconnected all machines from the router. Plugged back only this one, still comes up at 10mbps. This eliminates the possibility that the router can't handle all ports @100mbps.

* Disconnected both the DSL cable and the router cable. Plugged in the router cable. The router cable still comes up at 10mbps. This eliminates the possibility that the motherboard cannot handle both ports @100mbps.

I've arrived at a dead end. No matter what, the motherboard can talk to the router only @10mbps. The only possibility that I see is that the 'Intel Corporation 82541GI' NIC has an interoperability problem with this specific Linksys router hardware. It's a plain blue 5-port consumer router, plug in and go, no knobs to turn.

So, any suggestions, besides "get a new router"?


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