Same problem for me...

That's mine lspci -vvnn:

02:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8071 PCI-E 
Gigabit Ethernet Controller [11ab:436b] (rev 16)
        Subsystem: Acer Incorporated [ALI] Device [1025:014f]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 26
        Region 0: Memory at febfc000 (64-bit, non-prefetchable) [size=16K]
        Region 2: I/O ports at e800 [size=256]
        Expansion ROM at febc0000 [disabled] [size=128K]
        Capabilities: [48] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=1 PME-
        Capabilities: [50] Vital Product Data <?>
        Capabilities: [5c] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 
Enable+
                Address: 00000000fee0100c  Data: 4179
        Capabilities: [c0] Express (v2) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s 
unlimited, L1 unlimited
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- 
Unsupported-
                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ 
TransPend-
                LnkCap: Port #2, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency 
L0 <256ns, L1 unlimited
                        ClockPM+ Suprise- LLActRep- BwNot-
                LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ 
DLActive- BWMgmt- ABWMgmt-
        Capabilities: [100] Advanced Error Reporting <?>
        Capabilities: [130] Device Serial Number 90-fb-a6-ff-ff-29-45-ea
        Kernel driver in use: sky2
        Kernel modules: sky2

Dmesg is full of:

Mar 22 19:39:56 PcStream kernel: [88166.328760] sky2 eth0: Link is down.
Mar 22 19:40:00 PcStream kernel: [88169.870833] sky2 eth0: Link is up at 100 
Mbps, full duplex, flow control both
Mar 22 19:40:01 PcStream kernel: [88171.027428] sky2 eth0: Link is down.
Mar 22 19:40:07 PcStream kernel: [88177.375698] sky2 eth0: Link is up at 100 
Mbps, full duplex, flow control both

No way to got it working properly....

I will install  a new ethernet card soon, this situation is not
acceptable ( i'm running a cronjob every minutes with "ifconfig eth0 up"
-.- it reduces downtimes at 4-5 sec but that's not a good solution)

Please solve this problem! And contact me if you need other
informations! (sorry for my bad english :-D)

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https://bugs.launchpad.net/bugs/138611

Title:
  Sky2 ethernet failing randomly with Marvell 88E8056 gigabit

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