You have been subscribed to a public bug:
When the Power cable is unplugged, the Internet connection is alredy shown as
connected, but it dosn´t function.
The solution ist to enable the autoneg manually every time after the power
cable is unplugged.
sudo ethtool -s eth0 autoneg on
The netbook is a Samsung N150 with Ubuntu 12.4
more Information:
lspci -nnk | grep -iA2 net
05:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless
Network Adapter (PCI-Express) [168c:002b] (rev 01)
Subsystem: Foxconn International, Inc. Device [105b:e025]
Kernel driver in use: ath9k
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09:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8040 PCI-E
Fast Ethernet Controller [11ab:4354]
Subsystem: Samsung Electronics Co Ltd Device [144d:c072]
Kernel driver in use: sky2
ifconfig -a
eth0 Link encap:Ethernet Hardware Adresse 00:24:54:45:95:95
inet Adresse:10.42.0.1 Bcast:10.42.0.255 Maske:255.255.255.0
inet6-Adresse: fe80::224:54ff:fe45:9595/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:1149981 errors:0 dropped:0 overruns:0 frame:0
TX packets:1744626 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:92461226 (92.4 MB) TX-Bytes:2447087681 (2.4 GB)
Interrupt:18
sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: No
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: pg
Wake-on: d
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: Incomplete
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No network (eth) in Battery mode
https://bugs.launchpad.net/bugs/1053945
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Packages, which is subscribed to network-manager in Ubuntu.
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