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  1. Qt
  2. QTBUG-103957

[Reg 5.15 -> 6.3] QScreen::physicalSize() and QScreen::physicalDotsPerInch() give wrong results

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Details

    • Linux/X11
    • 27efadec22 (qt/qtbase/dev) 27efadec22 (qt/tqtc-qtbase/dev) b5422d2ad6 (qt/qtbase/6.3) b5422d2ad6 (qt/tqtc-qtbase/6.3)

    Description

      qDebug() << qApp->primaryScreen()->physicalSize()
         << qApp->primaryScreen()->physicalDotsPerInchY();
      • Qt 5: QSizeF(340, 190) 144.379
      • Qt 6: QSizeF(508, 285) 96.2526

       

      It appears that Qt 5 follows xrandr while Qt 6 follows xdpyinfo?

       

      xrandr

      eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 340mm x 190mm

       

      xdpyinfo

      dimensions: 1920x1080 pixels (508x285 millimeters)
resolution: 96x96 dots per inch

       

      Unfortunately, xdpyinfo seems to always assume DPI=96:

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-101038 Wrong physical DPI

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
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              liaqi Liang Qi
              skoh-qt Sze Howe Koh
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                Created:
                Updated:
                Resolved:

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