Selected style changed when returning from sleep

  • Hi everyone,

    I recently migrated my Qt app from Qt 4.8.4 to Qt 5.5, and I have some resiliant bug I need to fix.

    If i run the app, put the computer to sleep and then get back to the app, I may have some issue with the style :

    • most of the widgets are ok
    • some widgets are display with the default style.
    • every newly opened widgets are opened with the default style
    • selecting another style is correctly applied to the whole application.

    I do not get this behaviour every time, it's more like 1 on 5 try.

    I'm exclusively running my app on Windows 7, 64bits.

    I'm also a bit new to Qt so I'm totally lost. I don't know what to try, what to search, and what informations may be needed here to get some help.

    Thanks for any tips or hints !



  • Lifetime Qt Champion

    Hi and welcome to devnet,

    To be sure I understand you correctly: these bugs are only there since you moved your application to Qt 5 ?

  • @SGaist Hi, thanks !

    Yes no one ever experienced this problem before the Qt 5 migration.

  • Lifetime Qt Champion

    What does your application do ? Anything OpenGL related ?

    Can you create a small sample application that shows that behavior ?

  • Qt Champions 2017

    See also QTBUG-52728, it's probably related. It's supposed to be fixed in Qt 5.6.2.

    Kind regards.

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