aadb0a4a572c71745c5020cca2f4f8d604284383
Switch from reading `brightness` (software-requested) to `actual_brightness` (hardware-reported), which is the correct file on AMD GPU backlights where the two values can diverge. Replace the first-found device selection with a scored preference so that when multiple backlight devices are present (e.g. amdgpu_bl2 and nvidia_0) the internal laptop panel is chosen rather than a dGPU output that may report a fixed ceiling value. Priority: amdgpu/intel (3) > acpi/platform (2) > unknown (1) > nvidia (0).
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