10 Replies Latest reply on May 29, 2017 1:10 PM by Intel Corporation

    Intel 8260 contributing to High DPC Latency

    iluvtrollhd

      I can assure you

      • my BIOS is up to date,
      • the driver (19.50.1.5) is up to date.

      I've tried

      • setting my power plan to High Performance,
      • disabling "Allow the computer to turn off this device to save power",
      • setting my transmit power to Highest,
      • using WLAN Optimizer.

      Under Windows 10 Home, I'm connected to the router with a 5GHz signal. The problem is that I'm having a stuttering when playing some FHD videos. This is clearly attributable to Intel 8260 because the problem goes away in the wired connection. What should I do?

        • 1. Re: Intel 8260 contributing to High DPC Latency
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          Hello iluvtrollhd,

          We understand your system is experiencing latency and you suspect the wireless adapter may be the culprit. Please follow these steps for a clean driver installation:

          1. Download the latest driver from your Computer Manufacturer Support, as second option, you can use the generic version for Intel® PROSet/Wireless Software and Drivers for Windows* 10 [19.60.0]
          2. Go to Control Panel, Programs and Features and Uninstall "Intel® PROSet/Wireless Software", if it is installed. When prompted, choose the option to "Discard settings".
          3. In Control Panel, Device Manager, Network Adapters, right click on the Intel® Dual Band Wireless-AC 8260 and Uninstall it. Make sure you mark the option to "Delete the driver software for this device". 
          4. Reboot the PC or scan for hardware changes, check device manager and if an older wireless driver is detected and installed, repeat the actions to uninstall and delete it as well. Repeat this process until the OS does not allow deleting the driver, or until the controller shows as Unknown Device. 
          5. Remove temporary files: Press the Windows Key + R to open the run box. Type Cleanmgr.exe. Press OK. Select the main drive, usually C:\. Check Temporary Files and uncheck everything else. Press OK. 
          6. Install the Intel Wireless driver. During the first steps of PROSet/Wireless installation, make sure to customize the installation and install all driver components.

          - Also, apply the Recommended Settings for 802.11n Connectivity.

          If the issue persists, please provide the following information:

          - Download Intel® System Support Utility, run the tool with the connection work fine 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.
          - How did you determine that the adapter may be causing DPC latency? Provide any error or logs.

          Regards,
          Jonathan B.

          • 2. Re: Intel 8260 contributing to High DPC Latency
            iluvtrollhd

            I just did what you have suggested, but the problem never goes away. As I mentioned above, I concluded it's the Intel 8260 that's causing the problem because there's no stuttering in a wired connection. Here are the results of DPC Latency Checker. As you can see, the upper one is when I was connected to a wired network. On the other hand, the bottom is when I was using Intel 8260. In those two cases, I played a video file in my NAS whose bit rate is about 150Mbps~200Mbps (with software decoding).

            wired.png

            wireless.png

            • 3. Re: Intel 8260 contributing to High DPC Latency
              Intel Corporation
              This message was posted on behalf of Intel Corporation

              Hello iluvtrollhd,

              We checked the log and it does not show the information of the Wi-Fi network it is connected to, it seems it was disconnected or not working correctly. Please perform the following actions:

              - Make sure that both wireless antennas are firmly plugged to the wireless adapter.

              - Update the firmware of your wireless access point.

              - Try using the PC closer to the access point and check if it helps.

              For further assistance, let us know the following:

              - Was this adapter built from factory with your PC?

              - Has this ever worked fine?

              - Were there any changes around the time this issue started? (updates, new hardware/software, etc.)

              Regards,
              Jonathan B.

              • 4. Re: Intel 8260 contributing to High DPC Latency
                iluvtrollhd

                The log clearly has the information:

                 

                캡처.PNG

                 

                Originally, my motherboard had Intel 3260 installed in it, but I replaced it. However, you should note that I didn't ever try to play the same video file back then. This is because Intel 3260 doesn't seem to support enough bandwidth to handle this file in the first place.

                • 5. Re: Intel 8260 contributing to High DPC Latency
                  iluvtrollhd

                  Rolling back to the windows 10 default (19.1.0.4) greatly alleviate the symptoms. I guess I'll stick to this version.

                  • 6. Re: Intel 8260 contributing to High DPC Latency
                    Intel Corporation
                    This message was posted on behalf of Intel Corporation

                    Hello iluvtrollhd,

                    We are happy to know that the Windows* inbox driver works better in your system.

                    It seems the adapter may not be fully compatible with the system and the generic drivers. We advise you to check with the Computer Manufacturer if they support this configuration, and if so, what are the installation steps and drivers they recommend for this integration. Please check the following document for more information:

                    Regulatory Information Regarding Hardware Installation or Upgrade 

                    The missing information in the log was the channel, connection mode (n, ac, etc.), authentication and cipher; this is normally seen when the adapter is connected to a wireless network.

                    Please let us know in case you require further assistance.

                    Regards,
                    Jonathan B.

                    • 7. Re: Intel 8260 contributing to High DPC Latency
                      iluvtrollhd

                      The issue was alleviated in some degree, but I'm not sure it's completely gone. Furthermore, this solution keeps haunting me because I'm not able to install the latest driver. I just don't like the way it is.

                      • 8. Re: Intel 8260 contributing to High DPC Latency
                        Intel Corporation
                        This message was posted on behalf of Intel Corporation

                        Hello iluvtrollhd,

                        In this case, we advise you to engage the Computer Manufacturer Support. Please check with them about compatibility, updates and any additional recommendations they may have in order to prevent this issue.

                        Regards,
                        Jonathan B.

                        • 9. Re: Intel 8260 contributing to High DPC Latency
                          iluvtrollhd

                          I just installed Windows 7, and confirmed that the latest driver for Windows 7 did not have a problem. I'm pretty sure you should definitely look into the one for Windows 10. I must say, this issue is quite subtle that the majority of people won't recognize it at all...

                          • 10. Re: Intel 8260 contributing to High DPC Latency
                            Intel Corporation
                            This message was posted on behalf of Intel Corporation

                            Hello iluvtrollhd,

                            We are glad to know that your system is working better now that you are using Windows* 7. Keep in mind that custom integrations may not work well in every case, and the Computer Manufacturer is the best resource to handle this type of issue.

                            Feel free to contact us if you have further questions.

                            Regards,
                            Jonathan B.