Hi All,
I have a system with an Intel 82575 family Ethernet adapter. The
auto-negotiated speed changed after upgrading the kernel, with
everything else intact.
With 2.6.38 kernel when the interface is up I would see this line from kernel:
igb: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX
While with 3.4.43 kernel I would see this instead:
igb: eth0 NIC Link is Up 10 Mbps Half Duplex, Flow Control: None
I'm wondering what kernel change could have caused this? I'd rather
make a patch that reverts this change. Is it something in igb driver
or is it in another layer? Has anyone else seen this? I appreciate any
pointers! Please also see the ethtool output below.
2.6.38 ethtool output:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00002003 (8195)
drv probe hw
Link detected: yes
3.4.43 ethtool output:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 10Mb/s
Duplex: Half
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00002007 (8199)
drv probe link hw
Link detected: yes
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