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  1. Qt
  2. QTBUG-56104

Wrong Hi-Dpi Scaling with X on Kubuntu

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P2: Important P2: Important
    • 5.15
    • 5.8.0 Alpha
    • QPA: X11/XCB
    • Kubuntu 16.04, 4k Hi-Dpi monitor

      I had issues with Kubuntu and my 4k monitor, is it never saved the display scale factor correctly.
      Thus, I set the X config and .Xresources manually to 192x192 dpi:
      https://www.girialam.com/2016/02/kubuntu-and-hidpi-screen/

      When I started QtCreator, font and window scale was twice as large as expected. The device pixel ratio is set to 2.
      I tested the env variables QT_DEVICE_PIXEL_RATIO and QT_AUTO_SCREEN_SCALE_FACTOR in all combinations (screen shot attached(. The only correct output was achieved with (QT_DEVICE_PIXEL_RATIO=1 (but it was expected to be 2!) and QT_AUTO_SCREEN_SCALE_FACTOR=1).

      QML and QWidget windows seem to scale differently.
      This might be related to https://bugreports.qt.io/browse/QTCREATORBUG-16828

        1. DEVICE_PIXEL_1_AUTO_SCREEN_SCALE_0.png
          607 kB
          Michael Winkelmann
        2. DEVICE_PIXEL_1_AUTO_SCREEN_SCALE_1.png
          690 kB
          Michael Winkelmann
        3. DEVICE_PIXEL_2_AUTO_SCREEN_SCALE_0.png
          677 kB
          Michael Winkelmann
        4. DEVICE_PIXEL_2_AUTO_SCREEN_SCALE_1.png
          521 kB
          Michael Winkelmann
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            sorvig Morten Sørvig
            michaelwinkelmann Michael Winkelmann
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