Update Windows 10 KB5015878 'Preview' update released with gaming fixes

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Microsoft has released the optional KB5015878 Preview cumulative update for Windows 10 20H2, Windows 10 21H1, and Windows 10 21H2.

This update includes numerous bug fixes and enhancements, including gaming and Windows Autopilot fixes and a new Focus Assist feature.

The KB5015878 cumulative update preview is part of Microsoft's July 2022 monthly "C" update, allowing admins to test upcoming fixes released in the August 2022 Patch Tuesday.

What's new in Windows 10 KB5015878​

With this update, Microsoft has highlighted sixteen improvements, including a new focus assist feature, a Windows Autopilot fix, and fixes for video and audio playback in games.

Focus Assist is a do-not-disturb feature that hides distracting notifications from apps and Windows. With this update, Microsoft is adding a new feature that allows you to receive important notifications when Focus Assist is enabled.

This update also removes a Windows Autopilot provisioning restriction added by Microsoft as part of the June 2022 Patch Tuesday updates, when a vulnerability tracked as ' CVE-2022-30189 - Windows Autopilot Device Management and Enrollment Client Spoofing Vulnerability' was fixed.

In addition to the Focus Assist and Windows Autopilot changes, the Windows 10 KB5015878 cumulative update preview includes sixteen other improvements or fixes, with the six other highlighted ones listed below:
  • Addresses an issue that causes certain docking stations to lose internet connectivity when waking from Sleep mode.
  • Adds functionality that improves the OS upgrade experience.
  • Addresses an issue that might cause consecutive video clip playback to fail in games that use DX12.
  • Addresses an issue that affects certain games that use the XAudio API to play sound effects.
  • Addresses an issue that affects the height of the Search box when you use multiple monitors that have different resolutions.
  • Addresses an issue that prevents certain troubleshooting tools from opening.
 

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Microsoft shares workarounds for broken audio on Windows 10 after KB5015878​

According to the latest update from Microsoft on the official Windows Health Dashboard website, KB5015878 causes all sorts of audio problems on systems running Windows 10. The company has officially acknowledged the problem, shared workarounds for the affected customers, and applied the Known Issue Rollback System (KIR) to prevent the bug from spreading.

The software giant says the newest known bug in Windows 10 affects computers differently. Some users experience a complete audio blackout, while others only have audio on specific ports, devices, or applications. Microsoft's findings reveal that the affected audio drivers have the "audio enhancements" setting disabled before installing KB5015878, or the sound device driver has issues with the "audio enhancements" feature.

To prevent the problem from spreading, Microsoft applied the Known Issue Rollback system that can undo problematic changes without any action required from the end user. Interestingly, this time, KIR only ensures the bug will not affect other systems. Those who already have audio issues on Windows 10 after installing KB5015878 should apply one of three workarounds described below:
If you have not yet installed the update, you can do the following to prevent the issue:
  • Updating your audio device driver (also called "sound drivers" or "sound card drivers") might prevent this issue. If there are updated drivers available on Windows Update or from your Windows device manufacturer's (OEM) webpage, installing them might prevent this issue.
  • If you are using any advanced audio applications such as Open Broadcaster Software (OBS), it is recommended that you backup all your settings before installing the update.
If only certain apps are impacted, you can try the following to mitigate the issue:
  • Verify that the audio devices set within those apps are the expected devices. Audio endpoints might be reinitialized after KB5015878 is installed and some apps might set the audio devices for microphone and speakers to default.
  • If the device settings within the app are as expected, the apps might be caching the Windows Multimedia Device (MMDevice) ID. Caching the MMDevice ID is not recommended and might require reinstallation of the affected app or contacting support for the developer of the app for how to resolve the issue when audio endpoints are reinitialized and have new MMDevice IDs.
If you have already installed the update and are experiencing issues with audio on all apps, you can try the following to mitigate the issue:
  • The Windows audio or sound troubleshooter might be able to resolve the issue for you. You can launch the troubleshooter from Fix sound or audio problems in Windows by selecting the Open Get Help button in the article. The Get Help dialog window should open, and you will need to select yes to open the troubleshooter.
  • If your device's audio is still not working as expected, follow the instructions in Disable Audio Enhancements. Note: The article uses the microphone as an example, but you will need to do the steps for any affected audio device.