Windows scaling issues for high-DPI devices

Summary
When you use a high-DPI device such as a Surface Pro 3, Surface Pro 4, or Surface Book together with external monitors, you experience the following issues:

  • Elements such as applications, the taskbar, icons, toolbars, text, and dialog boxes appear to be fuzzy.
  • Elements are too large or too small compared to the rest of the desktop.
  • Blurry text appears in applications or in the Windows interface.
Although these symptoms may be seen on a single monitor, they're more common when you use multiple monitors that vary in display resolution. These symptoms also occur when the hardware configuration changes, such as when you dock and undock a device that uses external monitors, or you detach an external monitor from the device.

These issues commonly occur in the following scenarios:

  • Applications are moved between monitors that use different display resolutions.
  • The monitor that applications are displayed on changes between docked and undocked configurations.
  • Users mix connections during the same logon session. For example, users log on through a remote desktop connection (RDC), and later connect directly without first logging off.
Display information is determined when a user logs on to the system. A logoff-logon process resets the display information and improves behavior. However, the issue recurs if the monitor configuration changes during the same logon session, such as when you dock or undock the device or detach an external monitor.

This issue has become more prevalent since the introduction of 4k and higher resolution monitors, especially when these monitors are mixed together with older, standard monitors.

For more information about how Windows scales applications, see the following Core Team Blog articles:
Resolution
To resolve this issue, use the following methods.

  • Check for software updates

    Improvements are continuously being added to Windows 10 and Office 2016 applications. If you are experiencing a specific issue, first check whether it has been resolved in the latest Windows release or cumulative update. To check Windows 10 updates, see the following Microsoft Knowledge Base article:
  • Match screen resolutions

    Consider deploying monitors that have complementary screen resolutions.

    When you use multiple monitors (including when you dock or connect to remote screens), a greater difference in the resolution between the native device and external device is more likely to cause the issues to occur. For more information, see the following OneDrive presentation:
  • Use UWP applications

    Use or deploy Universal Windows Platform (UWP) applications instead of Win32 applications.

    Modern (UWP) apps always scale correctly. If there is a comparable modern app available, you can substitute that app to mitigate the scaling issues. For example, Edge is a modern app that does not cause the DPI Scaling issues that Internet Explorer might experience. Similarly, Remote Desktop is an alternative to mstsc.exe.

  • Check for known issues

    See the following articles for more information about known issues in these specific products.

    Office 2016

    Office apps appear the wrong size or blurry on external monitors

    Note Office 2016 applications started being released starting in September 2016. Additional updates are scheduled to follow.

    Internet Explorer

    3165808 Internet Explorer 11 Window display changes between built-in device monitor and an external monitor
Workaround
To work around scaling issues, try the following methods:

  • Log out and in

    Log out and log back in to the system. This improves how applications and elements are displayed when the monitor configuration changes.

  • Adjust display settings

    Windows 10

    Select Display > Change the size of text, apps, and other items, and then adjust the slider for each monitor.

    Earlier Windows systems

    Right-click the application, select Properties, select the Compatibility tab, and then select the Disable display scaling on high DPI settings check box.

  • Change application properties

    In Explorer or on the Start menu, right-click the application name, select Properties, select the Compatibility tab, and then select the Disable display scaling on high DPI settings check box.

  • Check whether applications are DPI-aware

    To determine an application's support of DPI Scaling, follow these steps:

    1. Download and run Sysinternals Process Explorer.
    2. In Process Explorer, click the columns, and then add the DPI Awareness column to the view.
    3. Start the application that you want to check.
    4. In Process Explorer, locate the application, and then examine the DPI Awareness column.
    DPI Awareness status definitions

    Per-Monitor Aware: Per-monitor DPI-aware. These applications check for the DPI when they are started, and adjusts the scale factor whenever the DPI value changes. These applications are not automatically scaled by the system.

    System Aware: System DPI-aware. These applications do not scale for DPI changes. They query for the DPI one time, and then use that value for the lifetime of the application. If the DPI changes, the application does not adjust to the new DPI value. It will be automatically scaled up or down by the system when the DPI changes from the system value.

    Unaware: DPI-unaware. These applications do not scale for DPI changes. They are always assumed to have a scale factor of 100 percent (96 DPI). These applications are automatically scaled by the system at any other DPI settings.

    For more information, see the following MSDN topic:
  • Report an issue

    Many UI elements have been updated because of customer feedback. Because DPI Scaling issues can involve multiple symptoms and configuration, information from users can help us identify specific scenarios and prioritize the development of updates.

    To provide such feedback, follow these steps:

    1. Record monitor configurations. To do this, take a screenshot of Display window (Start > Settings > System > Display).
    2. For each monitor, note the make and model, scaling percentage, and resolution.
    3. Record the steps that you must follow to reproduce the issue.
    4. Take screenshots or video of the desktop or applications before and after the scaling issues occur.
    5. Run DXDiag.exe on the system.
    6. Select Start > Feedback Hub. Search on “DPI” to check whether any listed issue matches your specific issue. If you find a match, you can add additional feedback, including screen shots, DXDiag results, and any other relevant information.
More information
Display scaling is a deceptively complex problem. There is no magic bullet or single fix to resolve all DPI Scaling problems. DPI Scaling benefits from continuous improvements in the core operating system, in application development models, and in applications from both Microsoft and third parties.

Different versions of Windows and application development models have different display scaling capabilities and limitations.

For example, the Windows 8.1 desktop environment and applications understand only one scale factor, generally based on the primary display at the time that the logon session starts. When the display changes in the middle of a logon session, the system bitmaps scale content from the system scale factor to the new monitor scale factor. This makes sure that content doesn’t become excessively large or small. However, text may appear blurred. (The effect is worse when you scale up.) If the system shrinks or stretches UI elements to the correct size, this may cause some blurriness in dialog boxes and other UI elements.

In Windows 10, investments were made so that large parts of the desktop UX will scale crisply in docking-undocking scenarios. Additional scalability improvements were made to the taskbar, File Explorer, desktop icons, context menu, and other UI elements to improve the user experience.

Microsoft is continuously updating the system and first-party applications. Third-party applications may require similar investments.
References
MSDN: Writing DPI-aware Win32 applications
High DPI
TechNet
High DPI Support for IT Professionals
Thurrott Blog: July 13, 2015 post that discusses DPI Scaling. Article is based on the "Devices" chapter of the Windows 10 Field Guide.
Windows 10 Feature Focus: Display Scaling


Windows Blog: July 15, 2013
Windows 8.1 DPI Scaling Enhancements
Build 2015: Display Scaling: What it is and what you need to know about it to have great visuals


http://channel9.msdn.com/Events/Build/2015/2-63

http://video.ch9.ms/sessions/build/2015/2-63_Build_2015_Windows_Scaling.pptx
Build 2014: Windows Desktop Development Platform Advancements

http:/video.ch9.ms/sessions/build/2014/2-535

http://video.ch9.ms/sessions/build/2014/2-535.pptx
Build 2013: Making your desktop apps shine on high-DPI displays
http://channel9.msdn.com/Events/Build/2013/4-184
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属性

文章 ID:3025083 - 上次审阅时间:10/13/2016 19:31:00 - 修订版本: 26.0

Windows 10, Windows 8.1, Surface Pro 4, Surface Pro 3, Surface Book

  • KB3025083
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