DPI Scaling between 4k and 2k screens on Windows

[reyemtm]

Describe the bug

How to Reproduce

QGIS and OS versions

Additional context

QGIS Version 3.10.5 Standalone
OS - Windows 10

Screen Resolution on Laptop - 4K 3840x2160
Screen Resolution on External Screen - 2K 2560x1440

When I open QGIS on the laptop the application window icons and all look as they should. When I move the application window to the 2K screen, the application does not scale properly - icons are huge. Other windows apps will show this behavior if part of the application window is on both the 4k screen and the 2k screen, but when the app gets moved completely to the 2k screen the resolution of the app is scaled properly. Chrome is one example.

If there are settings or other options to help with this situation please let me know.

[elpaso]

There are some QT environment variables that control DPI and scaling, AFAIK there isn't anything special about that in QGIS code.

You can have a look to: https://doc.qt.io/qt-5/highdpi.html#high-dpi-support-in-qt

I think this ticket should be closed as an upstream (QT) issue.

[reyemtm]

Related to - #20017? Also found this - https://docs.microsoft.com/en-us/windows/win32/hidpi/setting-the-default-dpi-awareness-for-a-process.

[reyemtm]

Workaround - but not sure the manifest file posted via #20017 is fully correct as it is from 2014. Sample File. Would be great if someone check that file that knows something about manifest files to see if it is correct and update as needed. The relevant settings in my manifest file are below. Again, this allows the application to scale properly over screens of different resolutions. I tried all of the settings and the system setting worked.

From the QT Documentation

System-DPI Aware | This level was introduced in Windows Vista. It differs from Per-Monitor DPI Aware only when multiple monitors are connected. Windows calculates a scaling that's suitable for all monitors connected.

Complete Working Manifest File

qgis-ltr-bin.exe.manifest

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
  <asmv3:application>
    <asmv3:windowsSettings>
      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">system</dpiAwareness>
    </asmv3:windowsSettings>
  </asmv3:application>
</assembly>

[github-actions]

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[github-actions]

While we hate to see this happen, this Issue has been automatically closed because it has not had any activity in the last 42 days despite being marked as feedback. If this issue should be reconsidered, please follow the guidelines in the previous comment and reopen this issue.
Or, if you have any further questions, there are also further support channels that can help you.

[oesteban-vx]

#43924 contains more information about this same issue.

[widsuoids]

This issue can be fixed on Windows using the High DPI Settings in the properties:

QGIS Executable/shortcut -> right click: properties -> Kompatibility ->Change High DPI settings button -> select both checkboxes + System(Advanced) in the dropdown -> (re)start QGIS