https://bugs.kde.org/show_bug.cgi?id=499982
--- Comment #7 from Méven <me...@kde.org> ---
(In reply to Méven Car from comment #6)
> (In reply to Zamundaaa from comment #5)
> > Do you have any non-default display settings? I've seen several cases with
> > similar glitches when 16 bit shadow buffers are used.
>
> I had ICC profiling using my built-in profile but turning it off didn't
> change a thing.
> Other than that I don't other none-default settings.
> I don't have any fractional scaling.
>
> If I turn off contrast effect or blur effect, the bug does not happen.
I now use a two external screens setup and the bug is harder to trigger now.
```
kscreen-doctor -o
Output: 1 eDP-1
disabled
connected
priority 0
Panel
Modes: 1:1920x1200@60*! 2:1600x1200@60 3:1280x1024@60 4:1024x768@60
5:1920x1200@60 6:1280x800@60 7:1920x1080@60 8:1600x900@60 9:1368x768@60
10:1280x720@60
Geometry: -1920,0 1920x1200
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: EDID
Color power preference: prefer accuracy
Brightness control: supported, set to 69% and dimming to 100%
Output: 2 DP-5
enabled
connected
priority 1
DisplayPort
Modes: 11:3840x2160@60*! 12:3840x2160@30 13:3840x2160@30
14:3840x2160@25 15:3840x2160@24 16:3840x2160@24 17:2560x1440@60
18:2048x1280@60 19:1920x1080@60 20:1920x1080@60 21:1920x1080@60
22:1920x1080@50 23:1920x1080@25 24:1920x1080@24 25:1920x1080@24
26:1600x1200@60 27:1600x900@60 28:1280x1024@75 29:1280x1024@60
30:1152x864@75 31:1280x720@60 32:1280x720@60 33:1280x720@50 34:1024x768@75
35:1024x768@60 36:800x600@75 37:800x600@60 38:720x576@50 39:720x576@50
40:720x480@60 41:720x480@60 42:720x480@60 43:720x480@60 44:640x480@75
45:640x480@60 46:640x480@60 47:640x480@60 48:720x400@70
Geometry: 0,0 2195x1235
Scale: 1.75
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: EDID
Color power preference: prefer accuracy
Brightness control: supported, set to 95% and dimming to 100%
Output: 3 DP-6
enabled
connected
priority 2
DisplayPort
Modes: 49:2560x1440@60! 50:2048x1152@60 51:1920x1200@60
52:1920x1080@60* 53:1920x1080@60 54:1920x1080@60 55:1920x1080@50
56:1920x1080@30 57:1920x1080@30 58:1920x1080@25 59:1920x1080@24
60:1920x1080@24 61:1600x1200@60 62:1680x1050@60 63:1280x1024@75
64:1280x1024@60 65:1200x960@60 66:1152x864@75 67:1280x720@60 68:1280x720@60
69:1280x720@60 70:1280x720@50 71:1024x768@75 72:1024x768@60 73:800x600@75
74:800x600@60 75:720x576@50 76:720x480@60 77:720x480@60 78:720x480@60
79:720x480@60 80:720x480@60 81:640x480@75 82:640x480@60 83:640x480@60
84:640x480@60 85:720x400@70
Geometry: 2195,0 1080x1920
Scale: 1
Rotation: 8
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: sRGB
Color power preference: prefer efficiency and performance
Brightness control: supported, set to 95% and dimming to 100%
```
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