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  1. Qt
  2. QTBUG-67160

EGLFS KMS dual screen setup not working ok for Qt Widget

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 5.9.3
    • None

    Description

      hello,

      i put together a small code snippet for QtCreator, to better showcase the issue i see in my dual-head setup with a Qt widget app running through EGLFS on a libMali.so/DRM/KMS setup on Allwinner A20 mainline based OS:

       https://github.com/aventuri/widgetMultiScreen

      the outcome is the wrong display of the two (yellow and red) rectangles with the code above only on the ext HDMI diplay. see:

      https://drive.google.com/open?id=1tGJxoBzBNn_wEhCi5mnI5a5zLSKIrAwX

      the puzzling issue is that if i comment out the w2.show() line:

      https://github.com/aventuri/widgetMultiScreen/blob/master/main.cpp#L3

      i can see (correctly) a single yellow screen on the primary LCD display.

      can someone point me toward better debugging? is a GDB step by step approach the best one?  the Qt stack is that huge..

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            lagocs Laszlo Agocs
            aventuri aventuri
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            Dates

              Created:
              Updated: