Filter
Top Products
126 Programmer’s Reference Manual
Intel® High Definition Audio BIOS Considerations
4.3 Intel
®
High Definition Audio PME Event
Although it is a PCI Express Root Complex Integrated endpoint, the Intel® HD Audio controller in
the ICH7 is not capable of supporting the native PME software model. Its PME is supported in the
same manner as a PCI PME.
The AC97_STS/AC97_EN bit-pair in ICH7 GPE0 register (PMBase+28h[5], PMBase+2Ch[5]) is
shared between AC97 and Intel® HD Audio PME event, depending on which one of the two
devices is selected and enabled by BIOS. To support this PME feature in ACPI OS environment,
BIOS needs to provide the proper _PRW object and \_GPE._L05() control method in the ACPI
name space. Below is an example of the ACPI name space for Intel® HD Audio/AC97 PME
support:
Scope (\_SB)
{
Device (PCI0) // PCI Bus0
{
Name (_BBN, 0) // Bus Number of PCI0
Method(_PRT, 0)
{
//
_PRT package for PCI0
}
……..
Device (AC97) // AC97 controller
{
Name(_ADR, 0x001E0002)// Device30:Func2
Name ( _PRW, Package () {0x05,0x03} ) // PME Wake
capability reporting
……..
} // End AC97
Device (AZAL) // Intel® HD Audio
controller
{
Name(_ADR, 0x001B0000)// Device27:Func0
Name ( _PRW, Package () {0x05,0x03} ) // PME Wake
capability reporting
……..