Qt Quick apps crash when clicking on ComboBox/drop-down menu
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It sounds like using Angle would solve your issue as the quality of DirectX driers tend to be better on windows. I would suggest at least trying to see if that solves your issue. But regardless you should report this as a bug. I suspect using Qt Quick on multiple graphics cards on the same desktop has simply not been tested that much given how rare such configurations are.
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Thanks for replying.
I did investigate ANGLE as an option for a while, but couldn't satisfactorily establish exactly what Windows versions it would support. The official Qt docs (http://qt-project.org/wiki/Qt-5-on-Windows-ANGLE-and-OpenGL) have a vague wording about ANGLE not working on XP saying "it does not fully work and may lead to crashes", whereas other sources I've found say it will work on XP SP2 and upwards, plus anything else that has DirectX 9.0c.
Anyhow, because of this uncertainty I decided to use old-school Qt Widgets for this project in the end.
PS. I admit it's an unusual monitor configuration, at least for the general public (maybe not so much for developers, I've worked with guys rocking 5-monitor setups), but I've never experienced a similar issue with any other apps on this setup.
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I have reported a bug for the same "QTBUG-35989":https://bugreports.qt-project.org/browse/QTBUG-35989. Please vote there.