Intel 82566DM-2 gigabit NIC incorrectly autonegotiates at 100 Mbit/s

I recently bought a gigabit switch but 1 desktop system with an Intel 82566DM-2 gigabit NIC (e1000e driver) always autonegotiates speed at 100 Mbit/s with it. I tried replacing & switching network cables with known working ones, but that didn't help. Other hardware, including an Ubuntu system with a Realtek gigabit NIC, works fine with the switch.

The problem exists with an up-to-date maverick 64-bit, both without and with linux-backports-modules-net installed.
The problem also exists when testing with a lucid 32-bit live-cd.

I also tried setting the speed to 1000 manually with ethtool, but that doesn't work either.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: janc 3285 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd0320000 irq 44'
   Mixer name : 'Realtek ALC883'
   Components : 'HDA:10ec0883,15d9b780,00100002'
   Controls : 30
   Simple ctrls : 18
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd0010000 irq 45'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100100'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed Oct 6 21:30:56 2010
HibernationDevice: RESUME=UUID=86dc905b-f39e-4b24-bf4c-5f6affc0fca9
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.

 virbr0 no wireless extensions.
MachineType: Supermicro C2SBA
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=68e5bca9-51a9-49cf-ada0-2412803e8659 ro crashkernel=384M-2G:64M,2G-:128M quiet splash
ProcEnviron:
 LANGUAGE=nl_BE:nl
 PATH=(custom, user)
 LANG=nl_BE.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:

SourcePackage: linux
WpaSupplicantLog:

dmi.bios.date: 08/01/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: C2SBA
dmi.board.vendor: Supermicro
dmi.board.version: PCB Version
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd08/01/2007:svnSupermicro:pnC2SBA:pvr0123456789:rvnSupermicro:rnC2SBA:rvrPCBVersion:cvnSupermicro:ct1:cvr0123456789:
dmi.product.name: C2SBA
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro