Qt 6.4 Known Issues

• Check that your system meets Qt's requirements
• All open issues can be found from Jira
  • RTA findings here
• Supported development platforms are listed here

All platforms

• Configuring Qt with -no-gui fails, see (QTBUG-107007)

• Module dependencies aren't installed automatically
  • e.g. quicknanobrowser example won't work if all dependencies aren't installed properly (QTBUG-106802)
    • Install webchannel & qtpositioning modules as well to solve the issue

• Copying text from QTextEdit to other applications does not handle line breaks well. This is a regression from Qt 6.3 (QTBUG-107004)

Linux

Qt applications using QProcess crash when run in qemu (QTBUG-98951) or under valgrind (QTBUG-87230).

• Workaround: configure Qt with

  -no-feature-forkfd_pidfd
  

Wayland

GNOME compositor(Mutter<42.6) crashes when opening combobox and then clicking in the middle of the main window. (QTBUG-107755) (mutter:2486)

• Workaround: Upgrade GNOME compositor(Mutter) to >=42.6 or run Qt apps with

  QT_QPA_PLATFORM=xcb
  

  (needs to have XWayland enabled).

Windows

• Fonts are too large on High DPI screen (regression in Qt 6.4.1, see QTBUG-108593)

Android

Qt for Android known issues

QTBUG-106939: Error: "qmlimportscanner not found" while building examples while using cmake

• Workaround: Just ignore the message

iOS

qtpdf binaries aren't available for iOS with Qt 6.4.0 but those can be compiled by yourself if needed