[arch-general] forcing speed/duplex on Intel e1000 driver

A service provider has forced all of their switch ports to 100/full. I need to do the same on a box running archlinux x86_64 w/kernel 2.6.22- ARCH and the Intel e1000 driver. I edited /etc/modprobe.conf to contain these lines: e1000 Speed=100,100,100,100 e1000 Duplex=2,2,2,2 However, the messages in /var/log/kernel.log indicate the interfaces are still coming up as 100/half which implies they are still attempting to autonegotiate and failing therefore defaulting to 100 (which can be sensed) and half-duplex (which can't be sensed, so this is the default). What's the best way to force the driver into 100/full on boot?