Priority: P1: Critical
Affects Version/s: 5.14.0 Alpha
Fix Version/s: 5.14.0 RC1
Environment:KDE Plasma, Linux, X11
qt5.git 5.14 branch, which points to qtwebengine.git 8daefcfd (from 9 days ago)
After I suspend and resume (on a Linux laptop with NVIDIA proprietary drivers), any application using QtWebEngine Widgets fails to paint anything.
This happened initially with kmail but I can reproduce it with the simplebrowser example.
The debug output says:
WARNING: QQuickWidgetPrivate::render|?libQt5QuickWidgets.so.5?|QQuickWidget::timerEvent QQuickWidget: Cannot render due to failing makeCurrent()
WARNING: QPlatformBackingStore::composeAndFlush|?libQt5XcbQpa.so.5?|QWidgetRepaintManager::flush composeAndFlush: makeCurrent() failed
(and that last line repeats many times).
If I switch to another virtual desktop and come back, both errors happen again.
The only workaround is to restart the app completely.
This used to work with Qt 5.13, I don't think I changed my nvidia driver since. Can't really check though, recompiling webengine is no picnic.
This does not happen with a simple QtQuick example.