Comment 32 for bug 512764

Update: I should have run more tests before I speak myself. Installing the latest Atheros driver (1.0.1.13) did not solve the problem. With this driver my network adapter would not even negotiate the media type successfully. This is the output of tail -f /var/log/syslog after enabling the atl1e module.

...
Sep 4 20:37:22 gaia kernel: [ 1558.898552] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:24 gaia kernel: [ 1560.532829] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:25 gaia kernel: [ 1561.322020] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:26 gaia kernel: [ 1562.956459] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:27 gaia kernel: [ 1563.745485] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:29 gaia kernel: [ 1565.401065] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:30 gaia kernel: [ 1566.194189] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:31 gaia kernel: [ 1567.802249] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:32 gaia kernel: [ 1568.591439] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:34 gaia kernel: [ 1570.225711] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:34 gaia kernel: [ 1571.014907] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:36 gaia kernel: [ 1572.649184] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:37 gaia kernel: [ 1573.438373] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:38 gaia kernel: [ 1575.072651] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:39 gaia kernel: [ 1575.861843] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:41 gaia kernel: [ 1577.494658] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:42 gaia kernel: [ 1578.285309] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:43 gaia kernel: [ 1579.919748] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:44 gaia kernel: [ 1580.708775] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:46 gaia kernel: [ 1582.378900] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
Sep 4 20:37:47 gaia kernel: [ 1583.161043] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Down
Sep 4 20:37:48 gaia kernel: [ 1584.769578] atheros_eth 0000:02:00.0: ATL1C: eth0 NIC Link is Up<100 Mbps Full Duplex>
...

I had to "modprobe atl1e media_type=4" to make it work.

I was connecting my computer to my router, a LiveBox Mini from Orange (Thomson I think). Connecting it to an AVM Fritz!Box resulted in successful 100Mbps media type negotiation even with the original driver that comes with Lucid Lynx (atl1c 1.0.0.1-NAPI).