can you show what's under D012 if the below does not work?
first several lines
DefinitionBlock ("", "SSDT", 2, "ACDT", "BRG0", 0x00000000)
{
External (_SB_.PCI0.GPP8.BRGA, DeviceObj)
External (_SB_.PCI0.GPP8.D012, DeviceObj)
External (DTGP, MethodObj) // 5 Arguments
Scope...