5 Replies Latest reply on Jun 21, 2017 1:23 PM by Intel Corporation

    Low download speed with AC 8260

    Filalex

      Hello,

       

      I have issue with Intel(R) Dual Band Wireless-AC 8260 on my notebook Lenovo Thinkpad x260

       

      OS Windows 10 x64 pro

       

      Download speed dramatically low on all wireless mode (a, b, g) 2,4 or 5 - nevermind. It is less than 1Mbps

      Upload is goog - about 100 Mbps on the a and g mode.

       

      I have another Lenovo laptop (x240). It's working fine without any issues with speed.

        • 1. Re: Low download speed with AC 8260
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          Hello Filalex,

          We understand that your computer is showing a slow wireless connection. This type of behavior can be caused by different factors, here are some initial recommendations for this:

          - Install the latest driver provided by the Computer Manufacturer Support. Or you can also try the generic version of Intel® PROSet/Wireless Software and Drivers for Windows® 10* [19.60.0].
          - Apply the configuration mentioned in the following document: Recommended Settings for 802.11n Connectivity.

          If the issue persists, please provide the following information:

          - Download Intel® System Support Utility, run the tool and use it to create a report with all sections, once the report is created, click on the "Next" button. In the following screen, save the report to a file. Then use the Advanced editor options of the communities to add the resulting file to your post as an attachment.
          - Access point model and firmware version.
          - What is the download/upload speed you expect to see? and which method are you using to test the speed?
          - Has the connection worked fine before?

          Regards,
          Jonathan B.

          • 2. Re: Low download speed with AC 8260
            Filalex

            Hello Jonathan B.

            1) Install the latest driver - done, version 19.60.0.7

            2) apply Recommended Settings for 802.11n Connectivity. - done

            3) run the Intel® System Support Utility  - done, the report in the attachement

            4) access point - Cisco AIR-AP1852 (OS version 10.3.141.0)

            5) upload speed - 110 Mbit/s, download speed 200 kbit/s - same results on different modes (2,4GHz b,g,n and 5GHz n,ac)

            6) on the old laptop (Lenovo x240) with wifi N7296 no issue - the speed about 100Mbit/s on both direction.

             

            Thanks you.

            • 3. Re: Low download speed with AC 8260
              Intel Corporation
              This message was posted on behalf of Intel Corporation

              Hello Filalex,

              We checked the log and the information looks normal for your configuration, the adapter is using 802.11ac with 144.4 Mbps connection rate:

              Radio Type: 802.11ac
              Receive Rate: 144.4 Mbps
              Transmit Rate: 144.4 Mbps
              Signal Strength: 99%

              We would like to mention that the difference you get between download and upload is very significant, so there may be an issue in the network. Here are some additional actions for you to consider:

              - Engage the network administrator and look for any bandwidth allocation feature that may be limiting the connection.
              - Contact Cisco Support and check with them about this as well.

              From the adapter side, here are couple actions that may improve connectivity, even though they may not account for the difference of 110 Mbps Upload vs 200 kbps Download:

              - Disable the Bluetooth* component of your wireless adapter, this is normally done with a hardware switch in the PC, or with a key combination, it can also be done within Windows* settings.
              - In the advanced driver properties, try enabling U-APSD support. As it may work better with newer Access points. You can disable it again if there is no improvement.
              U-APSD support: Enabled

              Regards,
              Jonathan B.

              • 4. Re: Low download speed with AC 8260
                Filalex

                Hello all.

                The issue was resolved.

                 

                Default Maximum Segment Size (MSS size) on enterprise WLC (like Cisco and others) is 1363. But this settings is incompatible with AC 8260. Changing MSS on a WLC to 1360 resolves the issue.

                Please, add this information to KB.

                • 5. Re: Low download speed with AC 8260
                  Intel Corporation
                  This message was posted on behalf of Intel Corporation

                  Hello Filalex,

                  We are glad to know the issue was solved. We are sure this information will be very useful for any other users facing this situation.

                  Regards,
                  Jonathan B.