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  1. Qt
  2. QTBUG-103346

[Wayland] unplugging 2nd screen will cause Qt applications to 100% CPU load due Qtfontconfig

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Details

    • Bug
    • Resolution: Incomplete
    • Not Evaluated
    • None
    • 5.15.2
    • GUI: Font handling
    • None

    Description

      Environment:

      Fedora 35
      KDE Plasma 5.24.4
      KDE Frameworks Version 5.91.0
      Qt 5.15.2
      

       

      While in a Plasma Wayland session, when I unplug the external display from my laptop, some Qt based applications [1] will start using 100% CPU due libQt5Gui.so and libfontconfig.so as you can see in the following "perf top" screenshots.
      Running "fc-cache -f -v" did not fix the problem

      [1]: like KeepassXC, Amarok, Konsole, Dolphin, etc.

      Attachments

        1. perf_top_2.jpg
          139 kB
          Germano Massullo
        2. perf_top.jpg
          75 kB
          Germano Massullo
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            esabraha Eskil Abrahamsen Blomfeldt
            germano Germano Massullo
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            Dates

              Created:
              Updated:
              Resolved:

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