https://bugs.kde.org/show_bug.cgi?id=501622

--- Comment #2 from FK <fk-kde-b...@ubermail.me> ---
(In reply to Zamundaaa from comment #1)
> Can't replicate that on my LCD's backlight dimming, though the brightness
> levels they turn on might be different from OLED.
> 
> Please attach the output of kscreen-doctor -o
SDR:
Output: 4 HDMI-A-1
        enabled
        connected
        priority 1
        HDMI
        Modes:  91:3840x2160@60*!  92:4096x2160@120  93:4096x2160@120 
94:4096x2160@100  95:4096x2160@60  96:4096x2160@60  97:4096x2160@50 
98:4096x2160@30  99:4096x2160@30  100:4096x2160@25  101:4096x2160@24 
102:4096x2160@24  103:3840x2160@120  104:3840x2160@120  105:3840x2160@100 
106:3840x2160@60  107:3840x2160@60  108:3840x2160@50  109:3840x2160@30 
110:3840x2160@30  111:3840x2160@25  112:3840x2160@24  113:3840x2160@24 
114:2560x1440@120  115:1920x1200@60  116:1920x1080@120  117:1920x1080@120 
118:1920x1080@100  119:1920x1080@60  120:1920x1080@60  121:1920x1080@60 
122:1920x1080@50  123:1920x1080@30  124:1920x1080@30  125:1920x1080@25 
126:1920x1080@24  127:1920x1080@24  128:1600x1200@60  129:1680x1050@60 
130:1280x1024@60  131:1440x900@60  132:1280x800@60  133:1152x864@60 
134:1280x720@60  135:1280x720@60  136:1280x720@50  137:1024x768@60 
138:800x600@60  139:720x576@50  140:720x480@60  141:720x480@60  142:720x480@60 
143:720x480@60  144:640x480@60  145:640x480@60  146:720x400@70 
147:1600x1200@60  148:1280x1024@60  149:1024x768@60  150:2560x1600@60 
151:1920x1200@60  152:1280x800@60  153:3840x2160@60  154:3200x1800@60 
155:2880x1620@60  156:2560x1440@60  157:1920x1080@60  158:1600x900@60 
159:1368x768@60  160:1280x720@60 
        Geometry: 0,0 3840x2160
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: Always
        RgbRange: unknown
        HDR: disabled
        Wide Color Gamut: disabled
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%
HDR:
Output: 4 HDMI-A-1
        enabled
        connected
        priority 1
        HDMI
        Modes:  91:3840x2160@60*!  92:4096x2160@120  93:4096x2160@120 
94:4096x2160@100  95:4096x2160@60  96:4096x2160@60  97:4096x2160@50 
98:4096x2160@30  99:4096x2160@30  100:4096x2160@25  101:4096x2160@24 
102:4096x2160@24  103:3840x2160@120  104:3840x2160@120  105:3840x2160@100 
106:3840x2160@60  107:3840x2160@60  108:3840x2160@50  109:3840x2160@30 
110:3840x2160@30  111:3840x2160@25  112:3840x2160@24  113:3840x2160@24 
114:2560x1440@120  115:1920x1200@60  116:1920x1080@120  117:1920x1080@120 
118:1920x1080@100  119:1920x1080@60  120:1920x1080@60  121:1920x1080@60 
122:1920x1080@50  123:1920x1080@30  124:1920x1080@30  125:1920x1080@25 
126:1920x1080@24  127:1920x1080@24  128:1600x1200@60  129:1680x1050@60 
130:1280x1024@60  131:1440x900@60  132:1280x800@60  133:1152x864@60 
134:1280x720@60  135:1280x720@60  136:1280x720@50  137:1024x768@60 
138:800x600@60  139:720x576@50  140:720x480@60  141:720x480@60  142:720x480@60 
143:720x480@60  144:640x480@60  145:640x480@60  146:720x400@70 
147:1600x1200@60  148:1280x1024@60  149:1024x768@60  150:2560x1600@60 
151:1920x1200@60  152:1280x800@60  153:3840x2160@60  154:3200x1800@60 
155:2880x1620@60  156:2560x1440@60  157:1920x1080@60  158:1600x900@60 
159:1368x768@60  160:1280x720@60 
        Geometry: 0,0 3840x2160
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: Always
        RgbRange: unknown
        HDR: enabled
                SDR brightness: 150 nits
                SDR gamut wideness: 0%
                Peak brightness: unknown
                Max average brightness: unknown
                Min brightness: 0 nits
        Wide Color Gamut: enabled
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%

It's really faint, almost unnoticeable - much lower luminance iirc than with
494854.

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