Post deployment to W11 March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037) causing split screen extended mode to have latency on one of the screen display

Question

After the Windows 11 deployment on March 10, 2026 (KB5079473, OS Builds 26200.8037 and 26100.8037), the split screen in extended display mode experienced intermittent latency on one of the displays.

The PC model is M70s Gen 5 Desktop (ThinkCentre), Type 12U2. The video output is through the motherboard’s DisplayPort (DP) and HDMI ports, using the Intel(R) UHD Graphics Family driver version 32.0.101.5972, both before and after the Windows update deployment. After rolling back the deployment, the issue was resolved.

Would like to know what is the root cause and how this can be rectified.

Answer 1

Hi Jimmy,

How is your issue going? Has it been resolved yet? If it has, please consider accepting the answer as it helps others sharing the same problem benefit too. Thank you :)

VP

Answer 2

Hi Jimmy,

The rollback successfully isolating the issue confirms that the KB5079473 deployment is the direct trigger for the latency on your extended display. The root cause lies within the Desktop Window Manager process, specifically how the updated operating system build handles hardware scheduling and frame synchronization across differing physical display protocols like HDMI and DisplayPort. When the update applies new rendering pipeline behaviors, the Intel graphics driver struggles to synchronize the refresh timing between the two distinct output methods, resulting in dropped frames and intermittent latency on the secondary screen.

To rectify this issue without permanently pausing critical Windows updates, you can disable Multiplane Overlay through the Windows Registry. Multiplane Overlay is a feature designed to reduce GPU workload, but it frequently conflicts with mixed-port multi-monitor configurations following major Windows build upgrades. You will need to open the Registry Editor and navigate to the path HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Dwm. Once in the Dwm folder, create a new DWORD (32-bit) Value named OverlayTestMode and set its value data to 5. This forces the system to bypass the problematic overlay planes and render the desktop directly, stabilizing the frame pacing across both monitors. After making this change, you can safely redeploy the Windows update and reboot the ThinkCentre desktop to ensure the configuration takes effect and the displays operate without latency.

Hope this answer brought you some useful information. If it did, please hit “accept answer”. Should you have any questions, feel free to leave a comment.

VP

Answer 3

The provided context does not describe any known issue with KB5079473 that matches intermittent latency on one display in an extended desktop configuration on Intel UHD Graphics.

The only documented items for KB5079473 in the context are:

• General description that it is a cumulative update for Windows 11, versions 25H2 and 24H2, containing security fixes and prior non‑security improvements.
• An announcement about Windows Secure Boot certificate expiration, unrelated to display performance.

The context also includes display‑related guidance, but for different scenarios:

• Safeguard holds for upgrading to Windows 11, version 24H2 on devices with certain Nvidia display adapters, due to potential loss of display after upgrade. This does not apply to Intel UHD Graphics and does not describe latency on only one screen.
• A resolved issue where some apps fail to playback, record, or capture video when using the WVC1 codec, which affects media/video capture, not extended desktop latency.
• Network Device Interface (NDI) streaming performance issues after specific August 2025 updates, affecting OBS/NDI streaming performance, not local dual‑monitor latency.

Within this context there is therefore no documented root cause or rectification steps specific to:

• KB5079473
• Intel(R) UHD Graphics Family driver 32.0.101.5972
• Intermittent latency on one monitor in extended mode on a ThinkCentre M70s Gen 5.

Because of that, no supported statement can be made here about the root cause or a definitive fix beyond what is in the documents.

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References:

• March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037)
• Guidance for updating to Windows 11, version 24H2 on devices with certain Nvidia display adapters
• Resolved issues in Windows 11, version 21H2
• August 12, 2025—KB5063878 (OS Build 26100.4946)
• August 26, 2025—KB5063842 (OS Build 19045.6282) Preview
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