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When the Power cable is unplugged, the Internet connection is alredy shown as 
connected, but it dosn´t funktion.
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
--
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: ubuntu
     Importance: Undecided
         Status: New

-- 
No network (eth) in Battery mode
https://bugs.launchpad.net/bugs/1053945
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