I am using Xubuntu 12.04 with Network Manager on my HP 5310m Laptop and get a weird problem on wired network.
When googling for answers, I found many people get the problem that wireless disconnects when laptop unplugged. For example, this question: Wireless disconnects when laptop unplugged from power source
However, my problem is that my wired network of my laptop will auto disconnect when unplugged from a power source. Now if I want to use wired network, I must have my laptop plugged. If someone unplugged the power source of my laptop, my network connection will lost at the same time.
I think this may be some kind of "power-save" method but I searched
/etc/pm-utils/power.d/ without find anything about wired network.
Can anyone help?