https://bugs.kde.org/show_bug.cgi?id=512170
Bug ID: 512170
Summary: QtQuick Icon Fringing on QD-OLED Displays
Classification: Applications
Product: systemsettings
Version First unspecified
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_icons
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 186833
--> https://bugs.kde.org/attachment.cgi?id=186833&action=edit
Red Trash/Delete icon fringing on right edge and tickers on slider in both
white and blue
## Summary
Red icons in System Settings show rainbow color fringing on QD-OLED displays
with mixed-DPI multi-monitor setup
## Environment
- Primary monitor: QD-OLED @ 100% scaling
- Secondary monitor: 4K @ 125% scaling
- Qt version: 6.10.0
- Session: Wayland
## Steps to Reproduce
1. Use a QD-OLED monitor at 100% scaling + a second monitor at 125% scaling
2. Open System Settings on the QD-OLED monitor
3. Navigate to Appearance → Icons
4. Look at the red trash icon next to installed icon packs
## Expected Result
Icons should render cleanly without color artifacts
## Actual Result
The red trash icon shows rainbow color fringing on one edge. The fringing
changes position when the window is moved. This
doesn't happen with white/gray icons, only red ones.
## Additional Details
QD-OLED displays use a different subpixel layout than regular LCD monitors
(triangular pattern instead of RGB stripe). I think
the issue is related to how icons are cached at different DPI scales and then
displayed - fractional pixel positioning causes
the color channels to misalign on the triangular subpixel layout.
White icons don't show this problem because all color channels are active. Red
icons make the misalignment obvious.
I tested several environment variables to work around it but nothing helped:
- QSG_ANTIALIASING_METHOD=none
- QT_QUICK_BACKEND=software
- Various other QtQuick rendering options
Note: Text rendering has a similar issue but is fixed with
`QT_SUBPIXEL_AA_TYPE=""`. That doesn't help with icons though.
The issue only affects QtQuick applications like System Settings. QWidget apps
like Dolphin don't have this problem.
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