SUMMARY On (my) NVIDIA GPU, transparent overlays are filled with checkerboard artifacts, with color affecting the visibility. This is most pronounced if Night Light is active, but can also be seen at the edge of window shadows. STEPS TO REPRODUCE 1. Set theme to Breeze Dark (most visible against a grey background) 2. Enable Night Light and activate it 3. Scrub through the color temperature slider OBSERVED RESULT A rapidly-flickering checkerboard artifact appears, with its intensity varying depending on the color. Example: https://files.catbox.moe/64f13k.mp4 EXPECTED RESULT Transparent overlays are free of artifacts. SOFTWARE/OS VERSIONS KDE Plasma Version: 6.4.5 KDE Frameworks Version: 6.19.0 Qt Version: 6.10.0 Kernel Version: 6.17.3-arch2-1 (64-bit) ADDITIONAL INFORMATION Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor Memory: 32 GiB of RAM (31.3 GiB usable) Graphics Processor: NVIDIA GeForce RTX 4060 Ti I have replicated this on Fedora KDE 42 and Kubuntu 25.10
What "transparent overlay" are you referring to? Also, if you have another screen to test with, does it happen there as well? I've seen displays do quite weird things when displaying certain colors.
(In reply to Zamundaaa from comment #1) > What "transparent overlay" are you referring to? > > Also, if you have another screen to test with, does it happen there as well? > I've seen displays do quite weird things when displaying certain colors. I have two monitors, with both of them hooked up the left one (A) has what's in the video, the other (B) appears to have a much smaller version of it. I tried unplugging them one at a time and swapping which port on the GPU they're plugged into; the effect remains the same- (A) has big checkerboarding, (B) has small. For "transparent overlay", sorry if my terminology is misleading. I've noticed it in the following places so far. It seems to be an issue with the color grey? - Night Light with certain color temperatures - Konsole with transparency enabled and a dark grey background: https://i.imgur.com/ahTvEz1.jpeg - Dolphin's title bar when a rename window is open: https://i.imgur.com/YuyBkKo.jpeg Though now that I've been staring at this for longer, the transparency might be a red herring? I think it's happening in the background of Dolphin's main area (Breeze Dark theme) and the background of this page, but it's quite hard to see (and will thus be nigh impossible to take a picture of) Sorry if I've posted this in the wrong area btw.
Okay. Well, night light doesn't use any overlay, but the artifacts happening with specific colors / brightness gives a hint at what's happening. If you take a screenshot of the colors and view it on a different device (a phone perhaps), does the pattern also show up there? If not, it sounds to me like it could be (bad) spatial dithering... I'll ask someone from NVidia if they do have that sort of feature in their hardware / driver.
Please, can you run nvidia-bug-report.sh and upload the generated file nvidia-bug-report.log.gz? It will contain information about monitors and how they are connected, that might help identify where the issue is.
> Please, can you run nvidia-bug-report.sh and upload the generated file > nvidia-bug-report.log.gz? It will contain information about monitors and > how they are connected, that might help identify where the issue is. Sorry, I forgot to mention, please update NVIDIA driver to 580.95.05 before running nvidia-bug-report.sh and make sure both monitors are connected while you run it.(In reply to Peter Kohaut from comment #4)
I'm not able to reproduce this on Plasma built from git-master on a laptop with an NVIDIA GPU on the built-in display or the external LG monitor NVIDIA driver 570.190
Created attachment 186087 [details] NVIDIA Bug Report output
(In reply to Zamundaaa from comment #3) > If you take a screenshot of the colors and view it on a different device (a > phone perhaps), does the pattern also show up there? Nope, everything looks normal on my phone.
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