https://bugs.kde.org/show_bug.cgi?id=412700
Bug ID: 412700
Summary: When closing a window in the "Show windows of all
Virtual Desktops" Overview then the screen hangs for
about 1 second
Product: kwin
Version: 5.12.8
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: dimitri.nuesche...@sunrise.ch
Target Milestone: ---
SUMMARY
When closing a window (or when hovering the mouse over 2 windows and the
desktop in the background) in the "Show windows of all Virtual Desktops"
Overview (Ctrl+F10), then rendering stops for one second. After about one
second the rendering continues at a normal framerate.
STEPS TO REPRODUCE
1. Open 2 windows (Maybe it shows even with one window). For instance 2
konsole-Terminals.
2. Press Ctrl+F10 in order to activate the "Show windows of all Virtual
Desktops" Overview.
3. Close one terminal window
OBSERVED RESULT
After closing the window, the screen content hangs for one second. The mouse
cursor movement is still rendered at proper speed. The hang occurs at the time
when the window is fading out as a result of the close action, but it doesn't
seem to be related to the exact state of the rendering.
My setup uses 2 monitors, but it is also possible to see the hang if only one
monitor is used.
With 2 monitors, however, it is possible to produce a hang by hovering the
mouse between 2 windows that are on different monitors. It is necessary to move
the mouse between the 2 windows and to hover also a piece of the desktop region
in order for the hang to show. It doesn't work when the 2 windows are on the
same monitor.
EXPECTED RESULT
Average framerate above 50 frames per second. Longest interval to be smaller
than 40 milliseconds.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 18.04 using X11
(available in About System)
KDE Plasma Version: 5.12.8
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5
ADDITIONAL INFORMATION
Kernel-Version: 4.18.0-18-generic
VGA Controller according to lspci: 00:02.0 VGA compatible controller: Intel
Corporation UHD Graphics 620 (rev 07)
Laptop Model: Thinkpad T480
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