Z690 TOMAHAWK WIFI DDR4 2.5G LAN problem

nexstar776154002db

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January 12, 2022

Z690 TOMAHAWK WIFI DDR4 2.5G LAN problem:

I can NOT get the onboard 2.5G LAN working.

I installed v26.2.0.1 from MSI’s site which did not work. I have tried installing older drivers as well as the newest from intel (v26.8) none of which work.

The “intel proset adapter configuration utility” says that there is a bad cable which is false. I installed a generic Realtek 1Gbps NIC card which is connecting fine to the “bad” cat 5 cable so it isn’t the cable.

I updated my bios to v1.10 which didn’t solve the 2.5G LAN issue.

The current settings in the bios:

  • Onboard LAN controller – enabled
  • LAN Option ROM – disabled
  • Network stack – disabled
  • BT Tile Mode – disabled
  • Onboard CNVi Module control – auto detection
I don’t know what else to do?

Do any of you have some suggestions?
 

Svet

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The “intel proset adapter configuration utility” says that there is a bad cable which is false. I installed a generic Realtek 1Gbps NIC card which is connecting fine to the “bad” cat 5 cable so it isn’t the cable.
I would still try with a better cable, the one can be not good enough for 2.5G LAN, could be more picky to cables.
Another which can try aside from a different cable:
different port of the router, different router, try force the ethernet driver manually via device manager.
 

garikfox

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For starters you'll need a CAT 6 cable.

There has been a bug with this chip for a very long time. The drivers are actually fine, the problem is when it tries to connect to a 2.5g device/router etc.

The fix is this. Drop it too 1.0 GBps Full Duplex instead of Auto Negotiation.

lan25.jpg
 

nexstar776154002db

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I would still try with a better cable, the one can be not good enough for 2.5G LAN, could be more picky to cables.
Another which can try aside from a different cable:
different port of the router, different router, try force the ethernet driver manually via device manager.
I tried your suggestions but, nothing changed. Thanks for responding to me.
 

nexstar776154002db

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For starters you'll need a CAT 6 cable.

There has been a bug with this chip for a very long time. The drivers are actually fine, the problem is when it tries to connect to a 2.5g device/router etc.

The fix is this. Drop it too 1.0 GBps Full Duplex instead of Auto Negotiation.

View attachment 155735
I had already tried your suggestion of setting the speed to 1.0Gbps Full Duplex. It didn't work. I should have put this in my testing data.
I did decide to try CRAZY settings like "10Mbps Full Duplex" which actually worked! BTW 10Mbps Half Duplex also worked but, NO speed above worked.
My Realtek nic card (Rated 1.0Gbps) worked on all the speed settings including of course 1.0 Gbps.

My understanding was that CAT 5 cables were simply limited in the distance they could properly transmit the signal and as long as you were not exceeding beyond short distances there wasn't a problem. It looks like I was not interpreting this correctly.
I am going to order a Cat 6a cable and will post back if it works. The 2.5Gbps Motherboard Lan working on 10Mbps using a CAT 5 cable stunned me! I did NOT expect that to happen.
One question >> Is the CAT 6a standard cable the one I want to buy? From reading some articles this appears to be the correct cable.
Thanks for your help.
 

nexstar776154002db

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