https://bugs.kde.org/show_bug.cgi?id=513365

--- Comment #6 from EC Optino <[email protected]> ---
I have switched to linux mainline (v6.19-rc4) on archlinux and the problem
disappeared (even when I switched back to linux 6.18). 

This should be a bug related to kernel driver module .

> git log --oneline v6.17..v6.19-rc3 -- drivers/gpu/drm/amd/ | grep -i -E 
> "backlight|brightness"
81f4d4ba5095 drm/amd/display: Don't change brightness for disabled connectors
f6eeab30323d drm/amd/display: Don't change brightness for disabled connectors
1454642960b0 drm/amd: Re-introduce property to control adaptive backlight
modulation
9dddfac98e3a drm/amd/display: fix duplicate aux command with AMD aux backlight
9858ea4c29c2 Revert "drm/amd/display: Only restore backlight after
amdgpu_dm_init or dm_resume"
a490c8d77d50 drm/amd/display: Only restore backlight after amdgpu_dm_init or
dm_resume
68f3c044f37d drm/amd/display: Indicate when custom brightness curves are in use
a3ae3384be77 drm: panel-backlight-quirks: Log applied panel brightness quirks
aef10b1138e9 drm: panel-backlight-quirks: Add brightness mask quirk
6eee1ef9e598 drm: panel-backlight-quirks: Convert brightness quirk to generic
structure
de63b0559357 drm/amd/display: Optimize custom brightness curve interpolation
34c9cd82dc62 drm/amd/display: Drop unnecessary 'rc' variable in
amdgpu_dm_backlight_get_level()
> git log --oneline v6.18..v6.19-rc3 -- drivers/gpu/drm/amd/ | grep -i -E 
> "backlight|brightness"
f6eeab30323d drm/amd/display: Don't change brightness for disabled connectors
1454642960b0 drm/amd: Re-introduce property to control adaptive backlight
modulation
9dddfac98e3a drm/amd/display: fix duplicate aux command with AMD aux backlight

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