Same Problem here with Lenovo Y580:

*-network
                description: Ethernet interface
                product: AR8161 Gigabit Ethernet
                vendor: Qualcomm Atheros
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: eth0
                version: 08
                serial: 20:89:84:29:52:b3
                size: 100Mbit/s
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm pciexpress msi msix bus_master cap_list 
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=alx 
duplex=full ip=192.168.0.120 latency=0 link=yes multicast=yes port=twisted pair 
speed=100Mbit/s
                resources: irq:31 memory:d3600000-d363ffff ioport:2000(size=128)

I'm running kernel version: Linux lap 3.19.0-21-generic
#21~14.04.1-Ubuntu SMP Sun Jun 14 18:45:42 UTC 2015 x86_64 x86_64 x86_64
GNU/Linux


workaround from Comment #12 worked - thanks!

Set the MPU

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https://bugs.launchpad.net/bugs/1458208

Title:
  AR8161 ethernet stopped working after upgrade from 3.19.0-16 to
  3.19.0-18

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