https://bugs.kde.org/show_bug.cgi?id=430659
Bug ID: 430659
Summary: external monitor flickering
Product: plasmashell
Version: 5.19.5
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: lucapaolom...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
Running Kubuntu on a laptop, the windows of some applications have random
flickering when moved to an external monitor, whereas the laptop monitor always
works correctly. In the worst cases the external monitor becomes black until
the flickering window is closed.
STEPS TO REPRODUCE
With Kubuntu on a laptop, the window of an application that is opened or moved
to an external monitor flickers, and in some cases the external monitor becomes
black. This happens very often but only with some apps: for example Thunderbird
and Firefox, and sometimes Libreoffice, but not Chrome (and the KDE apps I
tested work well too).
The external monitor is connected to the laptop with a VGA cable.
I have already tried what follows, with no results:
-- when possible, disabled hardware acceleration in the concerned apps;
-- set the external monitor as a replica or an extension of the laptop monitor;
-- changed the external monitor Refresh rate and Resolution;
-- changed all parameters of the Compositor (Scale method, Rendering backend,
Tearing prevention);
-- changed XOrg to Wayland.
Operating System: Kubuntu 20.10
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Kernel Version: 5.8.0-33-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-7500U CPU @ 2.70GHz
Memory: 7,5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 620
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