Very slow wifi down load speed with 23.120.0.3

[MymsMan]

I have a Dell Latitiude 5400 with Win 11 pro and Intel Wireless-AC 9560 160MHz adapter

Since installing this driver my download speed have dropped from 300-500Mbs to 40Mbs!

I have now rolled back the driver to 23.60.1.2 and full download speed has been restored.

The reason  I installed the newer driver was to attempt to resolve two other problems with the older driver:

• Inconsistent download speeds 40-500Mbs unless I disable TCP IPV6 in adapter properties (connecting to eero 6 router)
• Slow down load speed when running on battery power,  There are no wifi adapter power mangement options in Power plan advanced settings or on the adapter properties page.

[Mike_Intel]

Hello MymsMan,

Thank you for posting in Intel community Forum.

For me to further check this, please help provide the following details:

1. Was it working fine before?
2. Did you change any settings before the issue started?
3. How did you update the driver?
4. Can you also share where did you download the driver?

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[MymsMan]

1. Apart from the two issues noted in my original post it was working fine before update with download speed 300-500Mbps
2. I didn't change any settings
3. I installed (from Intel website) the Intel Driver & Support Assistant app, which did system scan, identified drivers needing update (wireless and bluetooth) and  installed them.  I used Rollback button on adapter properties page to restore previous driver level
4. Intel website

If I can provide further information or assist in testing let me know,

[Mike_Intel]

Hello MymsMan,

Thank you for the update.

Let me gather additional details about this issue.

1. Did you manually install this AC 9560 or this is embedded with your system?
2. Please help generate the SSU logs of your system, kindly refer to the link below on how to generate the logs:

https://www.intel.com/content/www/us/en/support/articles/000057926/memory-and-storage.html

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[MymsMan]

Wireless adapter is emedded in system, I have made no changes to the hardware configuration.

NordLynx VPN is shown as installed but was not active for any of the speed tests relating to this problem.

I have attached the SSU output

[Mike_Intel]

Hello MymsMan,

Thank you for the update.

Upon reviewing the SSU, you are using the wireless driver version 23.60.1.2.

The latest generic driver version that we have is version 23.120.0.

Please try to install the latest Wireless driver using clean driver installation method.

Kindly refer to the links below for the latest driver and steps on how to install the driver:

https://www.intel.com/content/www/us/en/download/19351/intel-wireless-wi-fi-drivers-for-windows-10-and-windows-11.html

https://www.intel.com/content/www/us/en/support/articles/000022173/wireless.html

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[MymsMan]

I have completed the uninstall of the wireless adater and  clean install of 23.120.0.3

Prior to reinstall  download  380.5Mbps

After reinstall and reboot  569.8Mbps

After awake from sleep   40.4Mps

Attached is SSU output taken at this point

After disable/enable adapter 469.5Mbps

So I am still suffering from slow speeds after computer awakens from Sleep state

This slowdown after sleep is repeatable

[Mike_Intel]

Hello MymsMan,

Thank you for the update.

Let's try the latest driver form Dell to isolate if this is a driver issue. Let me further explain why, we are doing this.

OEM laptop manufacturer can modify or enhance these controllers base on the design of their system and those changes are unknown to us.

You may check the link below and try to use their driver and observe if there will be improvements.

https://www.dell.com/support/product-details/en-my/product/latitude-14-5400-chrome-laptop/drivers

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[MymsMan]

I have downloaded and done a clean install of the latest driver from the Dell website,  version 23.90.2

Results are the same as with 23.120.0.3 from Intel website

Speed are very variable unless TCP IPv6 disabled

With IPv6 disabled

Speed 40Mbps after waking from sleep

Speed 400Mbps+ after disable/enable adapter

SSU output attached

[Mike_Intel]

Hello MymsMan,

Thank you for the information provided.  

I will do further research on this matter and post the response on this thread once it is available.

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician