I have a Sony Vaio E-14115 with dual boot - Windows 7 and Ubuntu 12.04.
I have a weird problem with my wired connection. The connection gets frequently disconnected when I'm on battery power (no Adapter plugged in). But, in most cases, when I plug in my AC power adaptor, the connection comes back on!! :O I don't normally get disconnections during usage when I'm on AC power.
But there are times when the connection works perfectly fine on battery power too!! I have no clue as to what is causing these disconnections to happen! I initially though that it was some issue with the hardware but there is no issue in Windows - it is specific to Ubuntu.
Will it be some issue related to my ethernet drivers in Ubuntu?? This is the output I get for the command
lshw -class network
*-network description: Ethernet interface
product: RTL8111/8168B PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:04:00.0
logical name: eth0
width: 64 bits
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168e-3_0.0.4 03/27/12 ip=10.5.40.253 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:43 ioport:c000(size=256) memory:f0a04000-f0a04fff memory:f0a00000-f0a03fff
The biggest blow is that SONY won't provide service for issues in Linux since they had preloaded my laptop with windows.