https://bugs.kde.org/show_bug.cgi?id=503458
Bug ID: 503458
Summary: Significant flickering in some application windows
when using "Prefer efficiency" color accuracy on
Nvidia
Classification: Plasma
Product: kwin
Version: 6.3.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: kwin-bugs-n...@kde.org
Reporter: accounts+...@chiller3.com
Target Milestone: ---
SUMMARY
When using the "Prefer efficiency" color accuracy option, the bottom half of an
application window sometimes has significant flickering. I'm consistently able
to reproduce this when maps.google.com is open in Firefox. However, when
changing to the "Prefer color accuracy" option, the issue goes away. Dropping
the refresh rate from 5120x2160@165Hz to 5120x2160@100Hz also makes the issue
go away.
Neither HDR vs SDR nor the VRR settings have any impact.
I've reported this to Nvidia at
https://forums.developer.nvidia.com/t/flickering-graphics-corruption-and-loss-of-signal-with-nvidia-4090-and-5k2k-screen-lg-45gx950a-b-aus/331111,
but I'm also reporting the issue here because when a window flickers, I can see
the contents of the windows behind it. I'm not sure if there might be a
potential compositing issue.
I recorded a couple videos to demonstrate the issue:
1. https://youtu.be/ybtIBgTleqQ - Shows the issue with both the "Prefer
efficiency" and "Prefer color accuracy modes"
2. https://youtu.be/chNFBBxxoVo - Shows the extent of the flickering and how
the contents behind the flickering window are visible
STEPS TO REPRODUCE
1. Open maps.google.com in Firefox
2. Split the screen and put the Firefox window on the right half (seems to
happen more frequently this way)
3. Drag the map around
OBSERVED RESULT
Significant flickering with the contents of windows underneath being visible
when the flickering occurs
EXPECTED RESULT
No flickering
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0
Kernel Version: 6.14.3-300.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 93.9 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090
Nvidia driver versions: Happens in both 575.51.02 (beta) and 570.133.07
(stable)
Monitor: LG 45GX950A-B.AUS
ADDITIONAL INFORMATION
I've tried swapping out both the monitor and the computer. I tried using the
same computer with an LG C1 OLED TV (3840x2160@120Hz). I also tried using the
same monitor with a different computer (Fedora 42 still), but with an Intel
iGPU. The issue is not reproducible in either scenario.
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