The link type on this card is mis-identified as FIBRE. I don't know if this is because of the driver or ethtool (although I'm using the current driver set from Intel directly).
I'm willing to test if you have an idea what to test :)
Current (2008-NOV-24) GIT HEAD gives the following:
root@lxfsrc1403:/usr/src/ethtool# ./ethtool eth2
Settings for eth2:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supports auto-negotiation: No
Advertised link modes: 10000baseT/Full
Advertised auto-negotiation: No
Supports Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes
whereas the card is connected (and only has) copper CX4 interfaces.
This is with a new (current) Intel driver plus a recompiled RHEL5.
I don't know if the card should support autoneg or not, or if any other non-trivial (to me) data are wrong in the output above. The link speed is 10gig at the moment, so that's okay.
root@lxfsrc1403:/usr/src/ethtool# ./ethtool -i eth2
"lspci -v" reports the following:
08:00.0 Ethernet controller: Intel Corporation 10 Gigabit AT CX4 Network Connection (rev 01)
Subsystem: Intel Corporation 10 Gigabit CX4 Dual Port Server Adapter
Flags: bus master, fast devsel, latency 0, IRQ 185
Memory at da080000 (32-bit, non-prefetchable) [size=128K]
Memory at da000000 (32-bit, non-prefetchable) [size=256K]
I/O ports at 3000 [size=32]
Memory at da0c0000 (32-bit, non-prefetchable) [size=16K]
[virtual] Expansion ROM at da600000 [disabled] [size=256K]
Capabilities:  Power Management version 3
Capabilities:  Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Capabilities:  MSI-X: Enable+ Mask- TabSize=18
Capabilities: [a0] Express Endpoint IRQ 0
Capabilities:  Advanced Error Reporting
Capabilities:  Device Serial Number c6-f8-20-ff-ff-21-1b-00
Let me know if you have something for me to test or if you need more info.