[plasmashell] [Bug 500997] The percentage of brightness slider does not sync with OSD settings on monitor that remembers per-mode brightness levels

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=500997

--- Comment #7 from lauhgjah...@duck.com ---
This may be a way to fix it, but I am not familiar with the KDE/KWin/Wayland
codebase to implement it:

Split brightness handling by device type. For external DDC/CI monitors (VCP
0x10 present and no sysfs backlight),
the slider value should be written verbatim to VCP 0x10. Normalization should
only be applied to internal/laptop backlights.

Pseudocode:

bool isExternalDDC = deviceCapabilities.contains(VCP_0x10) &&
!device.hasSysfsBacklight();

if (isExternalDDC)
    sendVcp(0x10, sliderValue);
else
    setBacklight( normalizeBrightness(sliderValue) );

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