https://bugs.kde.org/show_bug.cgi?id=395462

--- Comment #3 from magib...@hotmail.com ---
I have to add that Right Click on Desktop > 'Configure Desktop' has this issue
as well, with the difference that it's the plasmashell process that takes 100%
of CPU and freezes.

I made a backtrace of /usr/bin/systemsettings5 while it's frozen. It looks like
a graphics-related issue.

I tried to reproduce the issue in another computer with integrated graphics
Intel HD Graphics 4000 (i965 driver), but I couldn't. It works well there.

> #0  0x00007fffd8a97677 in ?? () from /usr/lib/dri/i915_dri.so
> #1  0x00007fffd8a98041 in ?? () from /usr/lib/dri/i915_dri.so
> #2  0x00007fffd8a3a18e in ?? () from /usr/lib/dri/i915_dri.so
> #3  0x00007fffd8a3fa4b in ?? () from /usr/lib/dri/i915_dri.so
> #4  0x00007fffd8a531fd in ?? () from /usr/lib/dri/i915_dri.so
> #5  0x00007fffd8a22975 in ?? () from /usr/lib/dri/i915_dri.so
> #6  0x00007fffd8a23318 in ?? () from /usr/lib/dri/i915_dri.so
> #7  0x00007fffd8a17f1a in ?? () from /usr/lib/dri/i915_dri.so
> #8  0x00007fffd877811e in ?? () from /usr/lib/dri/i915_dri.so
> #9  0x00007fffd8a17507 in ?? () from /usr/lib/dri/i915_dri.so
> #10 0x00007fffd8a17c89 in ?? () from /usr/lib/dri/i915_dri.so
> #11 0x00007fffd8b0e609 in ?? () from /usr/lib/dri/i915_dri.so
> #12 0x00007fffd8b0efef in ?? () from /usr/lib/dri/i915_dri.so
> #13 0x00007ffff1e921d7 in 
> QSGBatchRenderer::Renderer::renderUnmergedBatch(QSGBatchRenderer::Batch 
> const*) () from /usr/lib/libQt5Quick.so.5
> #14 0x00007ffff1e928dc in QSGBatchRenderer::Renderer::renderBatches() () from 
> /usr/lib/libQt5Quick.so.5
> #15 0x00007ffff1e98103 in QSGBatchRenderer::Renderer::render() () from 
> /usr/lib/libQt5Quick.so.5
> #16 0x00007ffff1e884ee in QSGRenderer::renderScene(QSGBindable const&) () 
> from /usr/lib/libQt5Quick.so.5
> #17 0x00007ffff1ec99fb in QSGDefaultLayer::grab() () from 
> /usr/lib/libQt5Quick.so.5
> #18 0x00007ffff1ec9fee in QSGDefaultLayer::updateTexture() () from 
> /usr/lib/libQt5Quick.so.5
> #19 0x00007ffff203ec77 in QQuickOpenGLShaderEffectMaterial::updateTextures() 
> const () from /usr/lib/libQt5Quick.so.5
> #20 0x00007ffff1e88e02 in QSGRenderer::preprocess() () from 
> /usr/lib/libQt5Quick.so.5
> #21 0x00007ffff1e884b9 in QSGRenderer::renderScene(QSGBindable const&) () 
> from /usr/lib/libQt5Quick.so.5
> #22 0x00007ffff1e88990 in QSGRenderer::renderScene(unsigned int) () from 
> /usr/lib/libQt5Quick.so.5
> #23 0x00007ffff1ec3030 in 
> QSGDefaultRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () from 
> /usr/lib/libQt5Quick.so.5
> #24 0x00007ffff1f26db5 in QQuickWindowPrivate::renderSceneGraph(QSize const&) 
> () from /usr/lib/libQt5Quick.so.5
> #25 0x00007ffff1fe7e8a in QQuickRenderControl::render() () from 
> /usr/lib/libQt5Quick.so.5
> #26 0x00007ffff23b1397 in ?? () from /usr/lib/libQt5QuickWidgets.so.5
> #27 0x00007ffff23b435e in QQuickWidget::resizeEvent(QResizeEvent*) () from 
> /usr/lib/libQt5QuickWidgets.so.5
> #28 0x00007ffff4ed5cce in QWidget::event(QEvent*) () from 
> /usr/lib/libQt5Widgets.so.5
> #29 0x00007ffff23b5256 in QQuickWidget::event(QEvent*) () from 
> /usr/lib/libQt5QuickWidgets.so.5
> #30 0x00007ffff4e95a74 in QApplicationPrivate::notify_helper(QObject*, 
> QEvent*) () from /usr/lib/libQt5Widgets.so.5
> #31 0x00007ffff4e9d341 in QApplication::notify(QObject*, QEvent*) () from 
> /usr/lib/libQt5Widgets.so.5
> #32 0x00007ffff3e91cb9 in QCoreApplication::notifyInternal2(QObject*, 
> QEvent*) () from /usr/lib/libQt5Core.so.5
> #33 0x00007ffff4ecda55 in 
> QWidgetPrivate::sendPendingMoveAndResizeEvents(bool, bool) () from 
> /usr/lib/libQt5Widgets.so.5
> #34 0x00007ffff4ed1af4 in QWidgetPrivate::show_helper() () from 
> /usr/lib/libQt5Widgets.so.5
> #35 0x00007ffff4ed4e35 in QWidget::setVisible(bool) () from 
> /usr/lib/libQt5Widgets.so.5
> #36 0x00007ffff4ed1aa9 in QWidgetPrivate::showChildren(bool) () from 
> /usr/lib/libQt5Widgets.so.5
> #37 0x00007ffff4ed1b12 in QWidgetPrivate::show_helper() () from 
> /usr/lib/libQt5Widgets.so.5
> #38 0x00007ffff4ed4e35 in QWidget::setVisible(bool) () from 
> /usr/lib/libQt5Widgets.so.5
> #39 0x00007ffff4ed4242 in ?? () from /usr/lib/libQt5Widgets.so.5
> ---Type <return> to continue, or q <return> to quit---
> #40 0x00007ffff3ebc3d2 in QObject::event(QEvent*) () from 
> /usr/lib/libQt5Core.so.5
> #41 0x00007ffff4ed576c in QWidget::event(QEvent*) () from 
> /usr/lib/libQt5Widgets.so.5
> #42 0x00007ffff4e95a74 in QApplicationPrivate::notify_helper(QObject*, 
> QEvent*) () from /usr/lib/libQt5Widgets.so.5
> #43 0x00007ffff4e9d341 in QApplication::notify(QObject*, QEvent*) () from 
> /usr/lib/libQt5Widgets.so.5
> #44 0x00007ffff3e91cb9 in QCoreApplication::notifyInternal2(QObject*, 
> QEvent*) () from /usr/lib/libQt5Core.so.5
> #45 0x00007ffff3e94d4c in QCoreApplicationPrivate::sendPostedEvents(QObject*, 
> int, QThreadData*) () from /usr/lib/libQt5Core.so.5
> #46 0x00007ffff3ee5a54 in ?? () from /usr/lib/libQt5Core.so.5
> #47 0x00007fffec84e368 in g_main_context_dispatch () from 
> /usr/lib/libglib-2.0.so.0
> #48 0x00007fffec84e5b1 in ?? () from /usr/lib/libglib-2.0.so.0
> #49 0x00007fffec84e63e in g_main_context_iteration () from 
> /usr/lib/libglib-2.0.so.0
> #50 0x00007ffff3ee5039 in 
> QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () 
> from /usr/lib/libQt5Core.so.5
> #51 0x00007fffe6e5c722 in ?? () from /usr/lib/libQt5XcbQpa.so.5
> #52 0x00007ffff3e9094c in 
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from 
> /usr/lib/libQt5Core.so.5
> #53 0x00007ffff3e98c46 in QCoreApplication::exec() () from 
> /usr/lib/libQt5Core.so.5
> #54 0x000055555555ee5f in ?? ()
> #55 0x00007ffff34fe06b in __libc_start_main () from /usr/lib/libc.so.6
> #56 0x000055555555eeea in _start ()

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