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82579LM will not connect to Linksys WRT 1900AC at 1 Gigabit


When I hardwire my HP EliteBook 8570w into my router (Linksys WRT 1900AC) the connection is only 100 Mbps. If I change the link speed from "Auto Negotiation" to "1.0 Gbps Full Duplex," the adapter will not connect. If I disconnect the cable and plug it into my cable modem (Cisco DPC 3008), the connection is 1 Gbps. Using the same Cat 5e cable, I connected another laptop to my router and it has a 1 Gbps link speed. To be sure the cable isn't the issue, I purchased a Cat 6 cable, but still connected at only 100 Mbps.

I installed the latest driver provided by HP for my Intel 82579LM Network Adapter (version, 5/2/2014). I tested the latest driver from Intel (version 19.5, 10/28/2014), but it did not fix the issue, so I re-installed v12.10.29.0 from HP.

I installed the latest firmware for my Linksys router (version

What could be causing this problem, and what do I need to do to fix it? All advice is greatly appreciated! Thank you!

System Specs:

  • HP EliteBook 8570w
  • OS: Windows 7 Enterprise 64-bit, SP1
  • RAM: 16 GB
  • Processor: Intel i7-3820QM 2.7 GHz
  • NIC: Intel 82579LM Gigabit Ethernet Controller, driver version: (5/2/2014)
  • Router: Linksys WRT 1900AC, firmware version:
  • Cable Modem: Cisco DPC 3008

Message was edited by: Sean McFerren (added laptop model)

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3 Replies

Hi sean-TX, please try to adjust the Gigabit Master Slave mode option found in the advanced tab of your network adapter, try change it to force slave mode.


Hi vince_intel, I changed the Gigabit Master Slave Mode setting to "Force Slave Mode" and then rebooted, but the link speed is still only 100 Mbps.

I also posted this issue on the Linksys forum. There, I was asked to plug in to each of the four ports on my router and report the link speed. After posting that all four connect at only 100 Mbps, I was told the router is defective. However, it seems odd that two other laptops connect to the ports on the router at 1 Gigabit, if the router is defective. Obviously, the problem exists only with the combination of my 82579LM and Linksys WRT 1900AC, but how do I know which one is the root problem?



Hi sean-TX, further isolation can be done by trying out the 82579LM on other gigabit router or can you share the network adapter brand\model on other laptops that was able to connect at 1 Gigabit, let's try to find the difference between 82579LM and those NICs. Another angle to look into is compatibility issue between the NIC and gigabit router.