Created attachment 188066 [details] Bright line sample SUMMARY Main issue: a white/bright bar shows up, exactly above the desktop panel when certain conditions are met. It's some 1-3px in width, and covers almost all the length of the panel. STEPS TO REPRODUCE 1. (probably) have my HW platform (AMD Ryzen 9, Radeon 890M) 2. Enable HDR 3. Enable floating desktop panel 4. "Blur" desktop effect ON OBSERVED RESULT The white/bright line appears EXPECTED RESULT No line. This was introduced just 1-2 months ago, never happened before. Also, disabling HDR fixes it. SOFTWARE/OS VERSIONS Operating System: Fedora Linux 42 KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.9.3 Kernel Version: 6.17.13-200.fc42.x86_64 (64-bit) Graphics Platform: Wayland Processors: 20 × AMD Ryzen AI 9 365 w/ Radeon 880M Memory: 32 GiB of RAM (27,2 GiB usable) Graphics Processor: AMD Radeon 890M Graphics Manufacturer: LENOVO Product Name: 83HN System Version: Yoga Pro 7 14ASP9 ADDITIONAL INFORMATION - I have attached a screenshot, in which you cannot see the bright line as I see it. I guess HDR gets disabled when taking screenshots. However, you can still see the line (even though way darker, kind of blue). The linee that I see is exactly the same, but really brighter, and white. - The issue severity is inversely proportional to the screen brightness. - The issue disappears completely when disabling the Blur desktop effect - Parallel to this issue, when screen brightness is very low, the contrast of desktop elements (e.g. panels, krunner, volume change indicator) is awful, like gray on gray for texts and washed out colors. I think all of them are connected together.