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  1. Qt
  2. QTBUG-29716

Qt5 Application Freezes if left for some time and if windows color depth is 16bit

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      Qt5 desktop applications (With QMainWindow and some QDialogs) seem to freeze after they've been on for a while (5-10 minutes). It usually happens when the application is on and left for some time and after a while you see it is frozen Or Application does not respond well and displays warning on console. "QWindowsBackingStore::flush: BitBlt failed (The handle is invalid.)"

      To reproduce this use attached example and follow below steps:
      click right mouse button on WIndows desktop, select Screen resolution, and then Advanced settings. Go to Monitor tab and set 16-bit to color depth and press OK.

      Then run the application and wait for it to initialize properly (it outputs some testing in the console window). Then press CTRL-ALT-DEL, and then Esc to go back to desktop. You will see the error message in the console window:

        1. main.cpp
          1 kB
        2. qtbug29716_diag_4.patch
          0.8 kB
        3. qtbug29716.tar
          10 kB
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            kleint Friedemann Kleint
            qtcomsupport Qt Support
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              Created:
              Updated:
              Resolved:

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