https://bugs.kde.org/show_bug.cgi?id=489350
Bug ID: 489350
Summary: Fullscreen games with gamescope cause
flickering/desktop showing through under X11 (6.1.0
and later)
Classification: Plasma
Product: kwin
Version: 6.1.1
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: spaceforce-t...@hotmail.com
Target Milestone: ---
SUMMARY
With the 6.1 update, fullscreen or borderless games run with gamescope under
X11 cause severe flickering between the game and the desktop, rendering the
game unplayable on my system. I am using the nvidia 550 drivers. Wayland does
not have this problem, but is unsuitable for my needs due to its greatly
restricted selection of 4:3 resolutions on my system and the need for a 4:3
desktop for my use case (scaling VGA mode 13h games that run in 320x200 4:3).
The problem can be avoided by rolling back to kwin 6.0.5 but using outdated
software is untenable in the long run.
STEPS TO REPRODUCE
1. Under an X11 session with nvidia, run a fullscreen low-resolution game (e.g.
Descent with DXX-Rebirth) using "gamescope -w 320 -h 200 -F pixel -S stretch
foo".
2. Observe flickering. It may not trigger immediately on login to a fresh
session; a surefire way to trigger it is by using nvidia-settings to set a
scaled 4:3 resolution.
3. Roll kwin and plasma-shell back to 6.0.5, restart, try again.
4. Flickering should be gone, and will return when kwin is updated again.
OBSERVED RESULT
Game flickers, bits of the desktop appear through the game visuals, game is
unplayable.
EXPECTED RESULT
Game should play smoothly and crisply in a simulation of 320x200 VGA as would
be rendered by a CRT or very old LCD monitor.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
Kernel: 6.9.6-zen
Video card: nVidia GeForce RTX 2070 8GB
Video driver: nvidia-dkms proprietary 550.90.07
Motherboard; Gigabyte GA-AB350 Gaming 3
Processor: AMD Ryzen 7 3800X
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