https://bugs.kde.org/show_bug.cgi?id=511196
Bug ID: 511196
Summary: Monitors without a Wayland window do not transition to
Night light without screen updates
Classification: Plasma
Product: kwin
Version First 6.5.0
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: night color
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
*See video to understand what is happening*
Monitors without any Wayland windows do not slowly transition to night
mode/blue light filter unless updates occur to the screen, e.g. a timer
incrementing 1 second would cause the blue light filter to resync with other
monitors each second.
If there is a Wayland window, the screen adjusts as expected (shown in video).
This bug does not care for X11 windows like Discord.
The bug creates jarring transitions as the blue light filter eases in on some
monitors, but not others.
STEPS TO REPRODUCE
1. Have multiple monitors connected (I have 4 total)
2. Have no or only X11 windows on one monitor
3. Set the night light/blue light filter with a timed transition (30 min)
4. Click the toggle from the bottom task bar tray
5. Observe as the blank monitor doesn't transition
6. Cause an "update"/redraw to the monitor, like moving the mouse to it and
observe the "catch up" jolt to the correct color
OBSERVED RESULT
The monitors do not sync the blue light filter transition
EXPECTED RESULT
The monitors should be synced as they slowly transition to full blue light
filter value
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 64 GiB of RAM (60.5 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 5090/PCIe/SSE2
Graphics Processor 2: NVIDIA GeForce RTX 5090/PCIe/SSE2
ADDITIONAL INFORMATION
Also the cursor doesn't update its color until it changes form (e.g. cursor to
window resizer), however this was noticed in 6.4.5. You can see it in the video
as well
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