lastest X550-T2 Windows10 doesn't advertise 2.5Gb speed

[leichuan]

Dear Support,

As the title indicated, lastest intel X550-T2 windows 10 doesn't advertise 2.5Gb speed, so we have link up issue with 2.5Gb speed.

We have debugged this issue with our SoC internal 2.5Gb PHY. 

If you need more details, please let me know.

Thank you,

Chuanhua

[B_Y]

Hi Chuanhua Lei,

Thank you for posting in Intel Ethernet Communities.

The autonegotiation for 2.5 and 5Gb speeds for the X550 was changed in 2020.

Default autonegotiation excludes the 2.5 and 5Gb speeds.

If 2.5 or 5Gb is chosen in the dropdown, it will change autonegotiation to only advertise that speed. So it is not forcing to 2.5Gb or 5Gb when those options are chosen, it changes the advertised speed.

That may be an issue if the switch is configured as forced to 2.5Gb instead of autonegotiate.

If that still does not help, please make sure the ethernet updated to the latest NVM and drivers.

I hope this makes sense. Please let me know if there is anything else we can do to help. In case we do not hear from you, we will make a follow up on April 28th 2023.

Thank you.

Best regards,

BY_Intel

Intel Customer Support

[leichuan]

Dear support,

When I choose 2.5Gb from dropdown menu, our SoC can only negotiated 2.5Gb half duplex mode.

[B_Y]

Hi Chuanhua Lei,

I hope this message finds you well. I am just sending a follow up if you have any questions from the previous post. If so, please let us know.

In case we do not hear from you, I will make a follow up on May 3rd 2023 .

Thank you.

Best regards,

BY_Intel

Intel Customer Support

[leichuan]

Dear Support,

So this means if our SoC supports up to 2.5Gb, it can only link up to 1Gb by default settting (autonegotiation).   If there is some signal quality issue, it may hit link up issue even for 2.5Gb dropdowm (forced from driver advanced). Somehow, it is not so convenient for customers to use.

I just wonder why you make these changes in 2020.

Best regards,

Chuanhua

[B_Y]

Hi Chuanhua Lei,

I hope this message finds you well. Thank you for your patience.

In certain use cases it would fail to obtain link when NBase-T speeds are included in autonegotiation.

Therefore was to DISABLE these two speeds from autonegotiation when the driver initializes but still give an end user means to enable them.

There may be a display issue that shows half duplex as it only supports Full Duplex for these speeds.

Thank you.

Best regards,

BY_Intel

Intel Customer Support

[B_Y]

Hi Chuanhua Lei,

I hope this message finds you well. I am just sending a follow up if you have any questions from the previous post. If so, please let us know. Thank you.

Best regards,

BY_Intel

Intel Customer Support

[B_Y]

Hi @leichuan ,

Please be informed that we will now close this request since we haven't received any response from our previous follow ups. Just feel free to post a new question if you may have any other inquiry in the future as this thread will no longer be monitored.

Best regards,

BY_Intel

Intel Customer Support