[Bug 309211] Re: Intel Gibabit Ethernet NIC (82541PI) operating at 100Mbps instead of 1000Mbps after upgrading to Hardy

[Thomas Antepoth]

When plugging the cable into the wall plug instead of the Linksys SD2005
the dmesg command shows that the same unchanged driver is in fact
capable to do 1000MB:

>From the freshly compiled 8.0.19 driver issued by intel which is loaded
by "modprobe e1000 AutoNeg=0x28" as suggested earlier:

Command:"ethtool eth0"

Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  Not reported
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: No
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000007 (7)
        Link detected: yes


Command: "ethtool -i eth0"

driver: e1000
version: 8.0.19-NAPI
firmware-version: N/A
bus-info: 0000:05:00.0


Plugged into the SD2005 switch:
[32234.423251] e1000: eth0: e1000_watchdog_task: NIC Link is Down
[32243.193686] e1000: eth0: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX


Plugged into the wall plug:
[33467.172950] e1000: eth0: e1000_watchdog_task: NIC Link is Down
[33478.655021] e1000: eth0: e1000_watchdog_task: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

And back to the switch again:
[33547.942638] e1000: eth0: e1000_watchdog_task: NIC Link is Down
[33563.045981] e1000: eth0: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX

Smells a bit like some issues in the speed negotiation between the NIC
and the switch - most probably in "e1000_phy.c". Will dig some more into
that.

-- 
Intel Gibabit Ethernet NIC (82541PI) operating at 100Mbps instead of 1000Mbps after upgrading to Hardy
https://bugs.launchpad.net/bugs/309211
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