AMDGPU_DM_DEFAULT_MIN_BACKLIGHT
#define AMDGPU_DM_MIN_SPREAD ((AMDGPU_DM_DEFAULT_MAX_BACKLIGHT - AMDGPU_DM_DEFAULT_MIN_BACKLIGHT) / 2)
caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;