https://bugs.kde.org/show_bug.cgi?id=510294

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |REPORTED
         Resolution|WAITINGFORINFO              |---

--- Comment #4 from [email protected] ---
before sleeping (laptop and 4k screen are both at 30%)

kscreen-doctor -o | grep -i bright
        Brightness control: supported, set to 30% and dimming to 100%
        Brightness control: supported, set to 30% and dimming to 100%

after sleeping:
kscreen-doctor -o | grep -i bright
        Brightness control: supported, set to 30% and dimming to 100%
        Brightness control: supported, set to 30% and dimming to 100%

brightnessctl -d amdgpu_bl1 set 30%
Updated device 'amdgpu_bl1':
Device 'amdgpu_bl1' of class 'backlight':
        Current brightness: 119700 (30%)
        Max brightness: 399000

kscreen-doctor -o | grep -i bright
        Brightness control: supported, set to 30% and dimming to 100%
        Brightness control: supported, set to 30% and dimming to 100%


Btw, sleeping is not really necessary:
Lock screen, then press ESC to switch off both screens, wait a bit, re-login is
sufficient for the increased brightness on the laptop screen

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