I can confirm that the JMC250 driver "jme version 1.0.8" which is part
of Ubuntu 14.04 LTS does NOT support EEE (802.3az) at 1000 Mbit/s. It
seems to support EEE ports at 100M, though.
Evidence:
When using a managed switch Zyxel GS1900-8, enabling the EEE at the
switch port will prevent connection and the PC indicates that the
ethernet cable is disconnected. When disabling EEE at that port, the PC
connects immediately at 1000M.
When using "unmanaged" switches (I tried TrendNet TEG-S50g), the only
solution I have found is the same as above: force the connection to 100
Mbit/s. There is no way to disable EEE (which the vendor calls
"Greennet").
sudo ethtool -s eth0 speed 100 duplex full.
The Trendnet unmanaged switch works fine at 1000M with Windows 7.
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https://bugs.launchpad.net/bugs/1310798
Title:
JMicron JMC250 ethernet: networking always disconnected
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