Sounds like the operating system hasn't recognize the network adapter being more than 10Mbps.
Im windows 7 so not sure where it is in 8 or if its the same but ill try, open networking and click on local area connection that's used and click properties.
If there is a configure button under 'connect using', click that. There will be series of tabs, click link speed and try 'identify adapter'
Does the description mention gigabit for connect using?
If generic, will need to find the correct driver for your laptop.