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I'm using Kubuntu 12.10. My router operate at 1Gbit connection with my other PC, I have 1Gbit ethernet card, cable is cat5e and can't setup 1Gbit ethernet connection. Only 100Mbit/s.

lspci|grep Ethernet

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)

sudo ethtool eth0

Settings for eth0:
    Supported ports: [ TP ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: Unknown
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000033 (51)
                           drv probe ifdown ifup
    Link detected: yes

Kernel module for ethernet card is r8168. What's wrong?

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What does dmesg | grep -iEC2 "(eth0|link|r8168)" give you? – gertvdijk Jan 29 at 18:48
This article may be of interest. – Steve-o Jan 29 at 19:08
@Steve-o OP seems to be using the correct r8168 driver. – gertvdijk Jan 29 at 19:18
@gertvdijk the comments date to 2012 and still experiencing problems to ones surprise. – Steve-o Jan 29 at 19:19
dmesg | grep -iEC2 "(eth0|link|r8168)" gives: pastebin.com/zpjF1rVg @Steve-o: I'm using r8168 kernel module, not r8169. – QkiZ Jan 30 at 17:58

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