https://bugs.kde.org/show_bug.cgi?id=494547
Bug ID: 494547
Summary: Parts of external screens "flickering"
Classification: Plasma
Product: kwin
Version: 6.2.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: misc@lwp.email
Target Milestone: ---
SUMMARY
After upgrading to KDE 6.2.0 on Wayland on Fedora 40, I experienced screen
"flickering" on my external monitors connected to a laptop. Most visible on
updating items, such as panels with widgets or movies.
STEPS TO REPRODUCE
1. Run KDE 6.2.0 on Wayland on an optimus laptop with AMD Radeon 780M/NVidia
4070 graphic cards
2. Connect any external monitor (HDMI or USB-C->DP)
3. Observe the flickering on updating objects (panels, movies) on external
monitors
OBSERVED RESULT
By "flickering" I mean very short corruptions of parts of the screen. Too short
to notice what the corruptions "include", but I think sometimes garbage,
sometimes parts of windows from other parts of the screen. Not sure though.
Most visible on movies, because occupying bigger part of the screen (not whole
image though). Tried with movies playing both in Firefox and through the system
player.
EXPECTED RESULT
No flickering/corruption. Was perfectly fine before the update, on Plasma 6.1.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
1. Bug present regardless if 1 or 2 external monitors is connected, and which
one of them (HDMI or USB-C->DP)
2. Not present on the built-in monitor of the laptop, regardless of the refresh
rate (144 Hz, or 60 Hz like the external monitors)
3. Chaning scaling on the external monitors did not help
4. I am not sure if both my external monitors are connected to the dGPU, or
just one. My laptop is ASUS TUF Gaming A15 FA507XI_FA507XI
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