I may have stumbled onto a fix.

Download e1000 driver version 8.0.9 from intel.com.
sudo make CFLAGS_EXTRA=-DE1000_MASTER_SLAVE=1 install
sudo rmmod e1000
sudo modprobe e1000 AutoNeg=0x28

It was the slave=1 part which finally made the difference. This setting
"forces it to master mode". I don't know enough about it to understand
what this means - I was just flipping all switches until things started
to work.

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Intel Gibabit Ethernet NIC (82541PI) operating at 100Mbps instead of 1000Mbps 
after upgrading to Hardy
https://bugs.launchpad.net/bugs/309211
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