Comment # 23 on bug 997171 from Antonio Larrosa

Just for the record, I submitted [1] a couple of days ago a patch for
libqt5-qtwebengine that detects if nouveau opengl drivers are being used and
disables the gpu usage so it's only used by the Qt thread, thus fixing the
crashes for the webengine related applications like akregator and kontact/kmail
in case anyone installs them and tries to use them. The patch also adds support
for two environment variables: QT_WEBENGINE_DISABLE_GPU to force the disabling
of the gpu 
and QT_WEBENGINE_DISABLE_NOUVEAU_WORKAROUND to disable the detection
of nouveau, just in case someone wants to try with newer nouveau releases.

[1] To SLE12-SP2, KDE:Qt5, KDE:Qt56, KDE:Qt57 and upstream (at QTBUG-41242 ).