Windows 10 DPI issues

Discussion in 'Parallels Remote Application Server' started by CoreyR, Feb 17, 2017.

  1. CoreyR

    CoreyR Bit Poster

    We've come across a interesting issue with Parallels Client for Windows, specifically on Windows 10 where a high resolution display such as a Surface Pro tablet (DPI at 200%) is connected to a lower resolution display such as 1920x1080 (DPI at 100%). Windows 10 introduced the ability to have different DPI settings set on a per-monitor basis. I believe this could be causing issues with applications published through RAS.

    Our environment consists of Parallels RAS 15.5 running on Windows Server 2012 R2 without the Desktop Experience enabled. Unfortunately the Desktop Experience is not supported by one of our most important applications.

    Scenario: A Surface Pro 4 tablet user is working on an external display without the Surface Tablet display enabled (it's disconnected in Windows' "Customize your display" settings). Sometimes our users enable the Surface Pro tablet display to add an additional monitor. When the Surface Pro tablet screen is enabled, some applications automatically move to the newly added display. This includes applications launched through the Parallels Client. When this happens, the Parallels applications disappear (they actually become black boxes). Disabling (disconnecting) the Surface tablet screen resolves the issue immediately. This issue does not seem to occur if all displays have the same resolution and DPI settings. This issue only occurs when the Surface Pro tablet screen is logically configured to the LEFT of the external monitor.

    Not working:

    Working: DisplaySettings-Working.png

    Feature request: support for monitors with different DPI configurations.
    Last edited: Feb 21, 2017
    iranf likes this.
  2. CoreyR

    CoreyR Bit Poster

    We've resolved these issues by enabling the option "Use RemoteApps if available" on the terminal servers. Now applications launched through RAS do not disappear when a high DPI screen is connected. It also resolved a few other issues we were having with minimized applications disappearing.
    Maria@Parallels likes this.
  3. Maria@Parallels

    Maria@Parallels Parallels Team

    @CoreyR thanks for sharing your workaround here.
  4. CoreyR

    CoreyR Bit Poster

    Unfortunately this was not the resolution a we tried numerous Compatibility configurations with no success. Enabling RemoteApp was the solution and it also resolved other issues we were having with disappearing task bar items.
  5. InnaS


    Display scaling has been a problem for a long time, and even though, Windows 10 has introduced changes to prevent blurry apps as a result of incorrect scaling. This problem I face while working with interesting presentation topics.

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