如果 BCL 沒被跑到 , 先檢查 VBIOS Seting
-> Panel #x -> BackLight Control Parameters->Inverter Type 必須選為 None/External
WDDM 的架構上是 monitor.sys會去問 WDDM video driver, 如果不 support 的話就會走標準的 ACPI standard: _BCM, _BCL, _BQC.
在 XP或Linux等其他沒有 WDDM video driver 就會走 ACPI 標準 interface
Brightness Control in WDDM
https://msdn.microsoft.com/en-us/library/windows/hardware/Dn653987.aspx
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Figure 1. WDDM Brightness Control Architecture in Windows Vista
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