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onboard Realtek LAN autonegotiates down to 100mbps

onboard Realtek LAN autonegotiates down to 100mbps
« on: September 28, 2012, 12:51:22 pm »
Hi folks,

I have a Realtek GBE onboard lan on my Gigabyte B75 motherboard.  when using a short cable (less than 3 meters) and connecting to Virgin Superhub, it connects at 1GB.  when using a 50MB cable which is what I need since I'm that long away from hub, it will only connect at 100mbps.  But if I unplug the cable from the pc and plug into my lenovo laptop, the laptop happily connects at 1Gbp.

I've tried all the settings I can think of on the LAN including updated drivers from Gigabyte, from Realtek, etc.  I can't get this LAN to work at gigabit ethernet.  the fact that the lenovo does work indicates the cable is not faulty.

the only thing I can think of is that the onboard LAN is somehow detecting the cable is very long and therefore using lower speed.  Any suggestions on how I can proceed?  Do I need to buy a new PCI card for this mobo?  or shoudl I look at a Gigabit switch (whcih may be a better idea and give me expansion)

thanks,
VJC